Crash when attempting to do anything in worlds with the Caves & Cliffs option enabled

@Matt Gartzke, How do you turnoff Caves & Cliffs Experimental Toggle on an existing world? My toggle is grayed out.

I'm hopeful it gets fixed soon - pretty much tanks the game.

In my survival world, breaking top snow crashes the game for some reason.

But on me,it crash when me breaking grass block on any survival world,just that.  That's so annoying on PE because you can accidentally break the grass when touching

When the game crashes, the villager population is reduced by a significant amount which results in over breading of the villagers. 

Yeah I've also had alot of negative affects from crashes, entire inventorys disappearing, boxes and all of its contents disappear, horses disappearing, minecarts disappear. Bees disappearing. But i beleive that to be a result of crashes and cannot be expected to be fixed short of preventing crashing in the first place

Crash when destroy flower. 

uh, this one is unknown, creating map several time. Its crash randomly everytime i do something. Sometime crash after destroy flower, grass, tree, dirt. With vanilla setting possible, with caves and cliff turned on.

The game crashes when either chopping tree blocks or in combat. On loading the game and same world it loads the last save but may have items gained before the crash. It even duplicated a bed. 

For me my case MCPE-129178 seemed to have been a duplicate but I want to add that for some other variants or cases of this issue, at times simply walking in a world generated by Caves and Cliffs experimental option can crash the game.

I also have this issue, both on Windows 10 and on Android 9. Although the issue is more common on the windows 10 edition, at least for me. It occurs mostly when breaking any block and seems to be random. I find it occurring more often when doing something else whilst breaking the block, e.g. swimming/jumping while breaking any block.

Caves and cliff toggle is on as well.

For me it happens when ever simply looking at any solid green object like grass, leaf's, ext.

I am having the same issue on Windows 10. I am fine if I break chunks where I spawned but if I move to another biome or a different island it keeps crashing when I try to break anything.  

Edit: There seems to be conflicting/two different codes running. I noticed today my screen keeps flashing a mob or "something" very quickly so it is like two different events are taking place code wise. My villagers are also moving like a flash character lol it is very funny to watch. 

Yep, was breaking a fence, crashed. Was running normally, crashed, was breaking a tree, crashed, pressed RT while on a horse, crashed. What I realized is it only crashed when in an old chunk (bedrock at 0), because my house was already there before toggling Caves and Cliff on, however, when I was in a cave away from my house, in an new chunk (bedrock at -60), I was able to play without any crashes, I do not know if it is a coincidence or if it matters.

@leo, it crashes for me in brand new areas too. Any idea if the nether is "safe"? Perhaps time to explore other realms?

It only crashes when I have the color green anywhere on my screen. ZERO green on screen= ZERO crashes for me!

From what I've experienced, sometimes the crash from breaking blocks can happen before you even fully break the block. I also wonder if block updates to tall grass blocks on abnormal blocks (ones tall grass can't normally appear/be placed on) receiving updates, and breaking automatically can cause a crash as well.

No I have tested this extensively on many worlds including a stone flat world and I can break green blocks if I am careful, and I can break every block without error I just can not have the color green on my screen without crashes. Includes carpet, wool, grass, leaf's, cactus, moss, vine's, sugarcane. It is 100% ONLY looking at color green that crashes my game. the color green, and dirt as well. ok I spent 10 hours testing this (and 500 crashes later) I learn the color green onj my screen is a 85% crash rate.. I can move forward back left and right 90% of the time with no crashes, and can look at dirt 60% of the time with no crashes, but if I try to adjust or move my camera angle with the color green on or entering my screen it will crash my game. I am free to spin my camera angle all I want as long as there is zero green anywhere. I have moved to the nether where there is zero green and it is working well for me. I could live in cave's, but with the new moss block it might be a risk if I come across it witch I have not done so yet, and doubt I will any time soon., but in the cave system I am free and work well, same as in my house. I tried to link my house and the caves together, but when trying to do so when I went to get up threw the dirt, and grass it was working... then is non-stopped crashed just by looking at the dirt/grass block's. I did find a escape and made it to the nether. not I live happily there with zero crashes, and zero green block's. =) I hope to go back for my 100 diamonds in my chests in my house in the overworld someday, however my nether portal in the overworld is less then 30 blocks of GREEN grass block's and I cant even go more then 5 without a crash... so... for now I am poor, desperate, and stuck in the nether.

Crashes also seem to vaporize horses/donkeys/mules. I was riding a horse prior to a crash...gone. Had a named mule in a stable...gone. Same with a donkey. Had a tamed horse in the vicinity of where I was mining prior to a crash...gone.

It happens in all seed and mostly some blocks, when you mine it with the wrong tool, like leaves with an axe, sugar cane with sword

When breaking or collecting with the wrong tool my worlds crash. 

Can confirm. I tried looking for a crash report but they aren't where they're supposed to be. 

Per Event Viewer:

Faulting application name: Minecraft.Windows.exe, version: 1.17.10.20, time stamp: 0x60ac0b5f
 Faulting module name: Minecraft.Windows.exe, version: 1.17.10.20, time stamp: 0x60ac0b5f
 Exception code: 0xc0000005
 Fault offset: 0x00000000024d0de8
 Faulting process id: 0x3d10
 Faulting application start time: 0x01d757babea6b1b0
 Faulting application path: C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\Minecraft.Windows.exe
 Faulting module path: C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\Minecraft.Windows.exe
 Report Id: 297393ec-f5bb-40b3-96f9-52ac4752b4a3
 Faulting package full name: Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe
 Faulting package-relative application ID: App

Per Windows own WER logs:
 Version=1
 EventType=MoAppCrash
 EventTime=132671153966100752
 ReportType=2
 Consent=1
 UploadTime=132671153970021267
 ReportStatus=268435456
 ReportIdentifier=506cb904-4b7a-4b2b-9905-01ab14667ba6
 IntegratorReportIdentifier=1c6b158b-7cc7-42fb-92f3-830d2d520f73
 Wow64Host=34404
 NsAppName=praid:App
 OriginalFilename=Minecraft
 AppSessionGuid=000011dc-0001-0090-f84e-31f2b557d701
 TargetAppId=U:Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe!App
 TargetAppVer=1.17.1020.0_x64_!2021//05//24:20:23:59!0!Minecraft.Windows.exe
 BootId=4294967295
 TargetAsId=791
 UserImpactVector=808465200
 IsFatal=1
 EtwNonCollectReason=1
 Response.BucketId=e560e8fdfbc2a58aa3129c1a4eb7fe27
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 Response.LegacyBucketId=1374332473105186343
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 Sig[0].Name=Package Full Name
 Sig[0].Value=Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe
 Sig[1].Name=Application Name
 Sig[1].Value=praid:App
 Sig[2].Name=Application Version
 Sig[2].Value=1.17.10.20
 Sig[3].Name=Application Timestamp
 Sig[3].Value=60ac0b5f
 Sig[4].Name=Fault Module Name
 Sig[4].Value=Minecraft.Windows.exe
 Sig[5].Name=Fault Module Version
 Sig[5].Value=1.17.10.20
 Sig[6].Name=Fault Module Timestamp
 Sig[6].Value=60ac0b5f
 Sig[7].Name=Exception Code
 Sig[7].Value=c0000005
 Sig[8].Name=Exception Offset
 Sig[8].Value=00000000024d135b
 DynamicSig[1].Name=OS Version
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 DynamicSig[2].Name=Locale ID
 DynamicSig[2].Value=1033
 DynamicSig[22].Name=Additional Information 1
 DynamicSig[22].Value=3a9a
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 DynamicSig[24].Value=be4b
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 DynamicSig[25].Value=be4b0a0665a957adb8c9d4412a7fbe53
 UI[2]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\Minecraft.Windows.exe
 LoadedModule[0]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\Minecraft.Windows.exe
 LoadedModule[1]=C:\Windows\SYSTEM32\ntdll.dll
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 LoadedModule[4]=C:\Windows\System32\ucrtbase.dll
 LoadedModule[5]=C:\Windows\System32\combase.dll
 LoadedModule[6]=C:\Windows\System32\RPCRT4.dll
 LoadedModule[7]=C:\Windows\System32\WS2_32.dll
 LoadedModule[8]=C:\Windows\System32\bcrypt.dll
 LoadedModule[9]=C:\Program Files\WindowsApps\Microsoft.VCLibs.140.00_14.0.29231.0_x64__8wekyb3d8bbwe\vccorlib140_app.DLL
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 LoadedModule[15]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\openxr_loader.dll
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 LoadedModule[37]=C:\Windows\System32\gdi32.dll
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 LoadedModule[39]=C:\Windows\System32\USER32.dll
 LoadedModule[40]=C:\Windows\System32\IMM32.DLL
 LoadedModule[41]=C:\Windows\System32\Windows.ApplicationModel.dll
 LoadedModule[42]=C:\Windows\System32\shcore.dll
 LoadedModule[43]=C:\Windows\SYSTEM32\twinapi.appcore.dll
 LoadedModule[44]=C:\Windows\system32\windows.storage.dll
 LoadedModule[45]=C:\Windows\SYSTEM32\Wldp.dll
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 LoadedModule[47]=C:\Windows\System32\shlwapi.dll
 LoadedModule[48]=C:\Windows\System32\Windows.Storage.ApplicationData.dll
 LoadedModule[49]=C:\Windows\System32\WinTypes.dll
 LoadedModule[50]=C:\Windows\SYSTEM32\CRYPTBASE.DLL
 LoadedModule[51]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\fmod_X64.dll
 LoadedModule[52]=C:\Windows\SYSTEM32\MFPlat.DLL
 LoadedModule[53]=C:\Windows\SYSTEM32\MFReadWrite.dll
 LoadedModule[54]=C:\Windows\SYSTEM32\MMDevAPI.DLL
 LoadedModule[55]=C:\Windows\System32\cfgmgr32.dll
 LoadedModule[56]=C:\Windows\SYSTEM32\DEVOBJ.dll
 LoadedModule[57]=C:\Windows\SYSTEM32\RTWorkQ.DLL
 LoadedModule[58]=C:\Windows\System32\Windows.Devices.Enumeration.dll
 LoadedModule[59]=C:\Windows\System32\DevDispItemProvider.dll
 LoadedModule[60]=C:\Windows\SYSTEM32\windows.staterepositorycore.dll
 LoadedModule[61]=C:\Windows\System32\Windows.UI.dll
 LoadedModule[62]=C:\Windows\SYSTEM32\WindowManagementAPI.dll
 LoadedModule[63]=C:\Windows\SYSTEM32\TextInputFramework.dll
 LoadedModule[64]=C:\Windows\SYSTEM32\InputHost.dll
 LoadedModule[65]=C:\Windows\SYSTEM32\CoreMessaging.dll
 LoadedModule[66]=C:\Windows\SYSTEM32\CoreUIComponents.dll
 LoadedModule[67]=C:\Windows\SYSTEM32\ntmarta.dll
 LoadedModule[68]=C:\Windows\System32\OneCoreUAPCommonProxyStub.dll
 LoadedModule[69]=C:\Windows\system32\uxtheme.dll
 LoadedModule[70]=C:\Windows\SYSTEM32\mrmcorer.dll
 LoadedModule[71]=C:\Windows\System32\msctf.dll
 LoadedModule[72]=C:\Windows\System32\Windows.Shell.ServiceHostBuilder.dll
 LoadedModule[73]=C:\Windows\system32\execmodelproxy.dll
 LoadedModule[74]=C:\Windows\SYSTEM32\RMCLIENT.dll
 LoadedModule[75]=C:\Windows\System32\UiaManager.dll
 LoadedModule[76]=C:\Windows\SYSTEM32\windows.ui.core.textinput.dll
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 LoadedModule[78]=C:\Windows\System32\twinapi.dll
 LoadedModule[79]=C:\Windows\System32\Windows.Graphics.dll
 LoadedModule[80]=C:\Windows\System32\Windows.Networking.Connectivity.dll
 LoadedModule[81]=C:\Windows\System32\Windows.Gaming.Input.dll
 LoadedModule[82]=C:\Windows\SYSTEM32\D3D12Core.dll
 LoadedModule[83]=C:\Windows\SYSTEM32\dxcore.dll
 LoadedModule[84]=C:\Windows\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a494df49ba2f9f36\nvldumdx.dll
 LoadedModule[85]=C:\Windows\SYSTEM32\VERSION.DLL
 LoadedModule[86]=C:\Windows\SYSTEM32\msasn1.dll
 LoadedModule[87]=C:\Windows\SYSTEM32\cryptnet.dll
 LoadedModule[88]=C:\Windows\System32\CRYPT32.dll
 LoadedModule[89]=C:\Windows\System32\WINTRUST.DLL
 LoadedModule[90]=C:\Windows\System32\imagehlp.dll
 LoadedModule[91]=C:\Windows\SYSTEM32\CRYPTSP.dll
 LoadedModule[92]=C:\Windows\system32\rsaenh.dll
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 LoadedModule[97]=C:\Windows\System32\ole32.dll
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 LoadedModule[99]=C:\Windows\SYSTEM32\USERENV.dll
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 LoadedModule[101]=C:\Windows\SYSTEM32\profapi.dll
 LoadedModule[102]=C:\Windows\SYSTEM32\dcomp.dll
 LoadedModule[103]=C:\Windows\SYSTEM32\dwmapi.dll
 LoadedModule[104]=C:\Windows\System32\NSI.dll
 LoadedModule[105]=C:\Windows\SYSTEM32\dhcpcsvc6.DLL
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 LoadedModule[107]=C:\Windows\SYSTEM32\DNSAPI.dll
 LoadedModule[108]=C:\Windows\system32\mswsock.dll
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 LoadedModule[113]=C:\Windows\System32\winrnr.dll
 LoadedModule[114]=C:\Windows\System32\rasadhlp.dll
 LoadedModule[115]=C:\Windows\System32\fwpuclnt.dll
 LoadedModule[116]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\MediaDecoders.UWP.dll
 LoadedModule[117]=C:\Windows\System32\Windows.Media.Devices.dll
 LoadedModule[118]=C:\Windows\System32\DDORes.dll
 LoadedModule[119]=C:\Windows\System32\DefaultDeviceManager.dll
 LoadedModule[120]=C:\Windows\SYSTEM32\AUDIOSES.DLL
 LoadedModule[121]=C:\Windows\SYSTEM32\powrprof.dll
 LoadedModule[122]=C:\Windows\SYSTEM32\UMPDC.dll
 LoadedModule[123]=C:\Windows\SYSTEM32\resourcepolicyclient.dll
 LoadedModule[124]=C:\Windows\SYSTEM32\AVRT.dll
 LoadedModule[125]=C:\Windows\System32\Windows.Media.Speech.dll
 LoadedModule[126]=C:\Windows\SYSTEM32\msvcp110_win.dll
 LoadedModule[127]=C:\Windows\SYSTEM32\urlmon.dll
 LoadedModule[128]=C:\Windows\SYSTEM32\iertutil.dll
 LoadedModule[129]=C:\Windows\System32\msxml6.dll
 LoadedModule[130]=C:\Windows\System32\Speech_OneCore\Common\sapi_onecore.dll
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 LoadedModule[133]=C:\Windows\SYSTEM32\WINHTTP.dll
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 LoadedModule[137]=C:\Windows\System32\speech_onecore\engines\tts\MSTTSEngine_OneCore.dll
 LoadedModule[138]=C:\Windows\System32\speech_onecore\engines\tts\MSTTSLoc_OneCore.DLL
 LoadedModule[139]=C:\Windows\System32\threadpoolwinrt.dll
 LoadedModule[140]=C:\Windows\SYSTEM32\windows.staterepositoryclient.dll
 LoadedModule[141]=C:\Windows\System32\Windows.Media.Audio.dll
 LoadedModule[142]=C:\Windows\SYSTEM32\HrtfApo.dll
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 LoadedModule[144]=C:\Windows\System32\Windows.ApplicationModel.Store.dll
 LoadedModule[145]=C:\Windows\SYSTEM32\webservices.dll
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 LoadedModule[149]=C:\Windows\SYSTEM32\WININET.dll
 LoadedModule[150]=C:\Windows\SYSTEM32\ondemandconnroutehelper.dll
 LoadedModule[151]=C:\Windows\SYSTEM32\WINNSI.DLL
 LoadedModule[152]=C:\Windows\system32\schannel.DLL
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 LoadedModule[154]=C:\Windows\SYSTEM32\NTASN1.dll
 LoadedModule[155]=C:\Windows\SYSTEM32\ncrypt.dll
 LoadedModule[156]=C:\Windows\system32\ncryptsslp.dll
 LoadedModule[157]=C:\Windows\System32\Windows.Security.Authentication.Web.Core.dll
 LoadedModule[158]=C:\Windows\System32\OneCoreCommonProxyStub.dll
 LoadedModule[159]=C:\Windows\System32\vaultcli.dll
 LoadedModule[160]=C:\Windows\System32\Windows.StateRepositoryPS.dll
 LoadedModule[161]=C:\Windows\System32\XblAuthTokenBrokerExt.dll
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 LoadedModule[163]=C:\Windows\SYSTEM32\usermgrcli.dll
 LoadedModule[164]=C:\Windows\system32\CoreShellAPI.dll
 LoadedModule[165]=C:\Windows\System32\ComposableShellProxyStub.dll
 LoadedModule[166]=C:\Windows\System32\WinRtTracing.dll
 LoadedModule[167]=C:\Windows\System32\wpnapps.dll
 LoadedModule[168]=C:\Windows\SYSTEM32\XmlLite.dll
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 LoadedModule[171]=C:\Windows\SYSTEM32\BiWinrt.dll
 LoadedModule[172]=C:\Windows\SYSTEM32\FirewallAPI.dll
 LoadedModule[173]=C:\Windows\SYSTEM32\fwbase.dll
 LoadedModule[174]=C:\Windows\System32\certenroll.dll
 LoadedModule[175]=C:\Windows\SYSTEM32\certca.dll
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 LoadedModule[177]=C:\Windows\System32\WLDAP32.dll
 LoadedModule[178]=C:\Windows\system32\mlang.dll
 LoadedModule[179]=C:\Windows\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a494df49ba2f9f36\nvcuda64.dll
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 LoadedModule[182]=C:\Windows\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a494df49ba2f9f36\nvrtum64.dll
 LoadedModule[183]=C:\Windows\SYSTEM32\gpapi.dll
 LoadedModule[184]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\nvngx.dll
 LoadedModule[185]=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\nvngx_dlss.dll
 State[0].Key=Transport.DoneStage1
 State[0].Value=1
 ProcessMetadata[0].Key=experiments_active
 ProcessMetadata[0].Value=CnC_
 OsInfo[0].Key=vermaj
 OsInfo[0].Value=10
 OsInfo[1].Key=vermin
 OsInfo[1].Value=0
 OsInfo[2].Key=verbld
 OsInfo[2].Value=19041
 OsInfo[3].Key=ubr
 OsInfo[3].Value=928
 OsInfo[4].Key=versp
 OsInfo[4].Value=0
 OsInfo[5].Key=arch
 OsInfo[5].Value=9
 OsInfo[6].Key=lcid
 OsInfo[6].Value=1033
 OsInfo[7].Key=geoid
 OsInfo[7].Value=244
 OsInfo[8].Key=sku
 OsInfo[8].Value=48
 OsInfo[9].Key=domain
 OsInfo[9].Value=0
 OsInfo[10].Key=prodsuite
 OsInfo[10].Value=256
 OsInfo[11].Key=ntprodtype
 OsInfo[11].Value=1
 OsInfo[12].Key=platid
 OsInfo[12].Value=10
 OsInfo[13].Key=sr
 OsInfo[13].Value=0
 OsInfo[14].Key=tmsi
 OsInfo[14].Value=221115888
 OsInfo[15].Key=osinsty
 OsInfo[15].Value=2
 OsInfo[16].Key=iever
 OsInfo[16].Value=11.789.19041.0-11.0.1000
 OsInfo[17].Key=portos
 OsInfo[17].Value=0
 OsInfo[18].Key=ram
 OsInfo[18].Value=32652
 OsInfo[19].Key=svolsz
 OsInfo[19].Value=465
 OsInfo[20].Key=wimbt
 OsInfo[20].Value=0
 OsInfo[21].Key=blddt
 OsInfo[21].Value=191206
 OsInfo[22].Key=bldtm
 OsInfo[22].Value=1406
 OsInfo[23].Key=bldbrch
 OsInfo[23].Value=vb_release
 OsInfo[24].Key=bldchk
 OsInfo[24].Value=0
 OsInfo[25].Key=wpvermaj
 OsInfo[25].Value=0
 OsInfo[26].Key=wpvermin
 OsInfo[26].Value=0
 OsInfo[27].Key=wpbuildmaj
 OsInfo[27].Value=0
 OsInfo[28].Key=wpbuildmin
 OsInfo[28].Value=0
 OsInfo[29].Key=osver
 OsInfo[29].Value=10.0.19041.928.amd64fre.vb_release.191206-1406
 OsInfo[30].Key=buildflightid
 OsInfo[31].Key=edition
 OsInfo[31].Value=Professional
 OsInfo[32].Key=ring
 OsInfo[32].Value=Retail
 OsInfo[33].Key=expid
 OsInfo[34].Key=fconid
 OsInfo[35].Key=containerid
 OsInfo[36].Key=containertype
 OsInfo[37].Key=edu
 OsInfo[37].Value=0
 FriendlyEventName=Stopped working
 ConsentKey=MoAppCrash
 AppName=Minecraft
 AppPath=C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.17.1020.0_x64__8wekyb3d8bbwe\Minecraft.Windows.exe
 NsPartner=windows
 NsGroup=windows8
 ApplicationIdentity=D53982E4A9AC0C80F447C22B1BA8CB26
 MetadataHash=-501597663

From a log contained in AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\crash :

{\{ "crash": 0, "begin": 1622640225, "tags": { "experiments": "[\"CnC_\"]", "viewDistanceChunks": "56" }, "flavor": "Publish", "branch": "main", "commit": "1f7fda0939ec62c52224973ed97a5796438e30b4", "build": "1.17.10.20", "device": "bd82f9d8-cfea-3987-9bbf-f77c87c35972", "id": "1aebf82e-b7af-4cd9-9f41-f563e73521b5"}

@unknown: Crash reports are automatically sent to Mojang on Bedrock, so there is no need to find one.

I am experiencing this bug as well, I have captured it twice with screen record.  Can recapture as many times as you may need. 

These two video attachments are not a duplicate, it is a repeated attempt to chop the same tree with the same axe in the same seed with the same result in beta.  I am also including a screenshot of the world edit screen to show the seed #.