Will S.

I am  also experiencing this issue on my Alienware Win 10 PC with Minecraft Bedrock edition. I contacted Microsoft originally to resolve the issue, exhausted all of their troubleshooting steps and was referred to Mojang after being able to login, then play, Minecraft on our Xbox One. I was literally about to file a trouble ticket myself until I ended up resolving the issue myself. 

The troubleshooting  steps I was told to try were:

1. Delete my profile information (That option is not under settings. If you go to "Manage Account" it pulls up the Xbox app, where you should be logged in. My Xbox app wouldn't open. They both stopped working at the same time. )

2. Deleting and reinstalling Minecraft & the Xbox app. (That didn't work either AND I lost my worlds)

What DID work was Xbox Live Authorization Manager . It's located use Task Manager/Services. It had become unchecked at some point in time. I'm honestly unsure how it happened to begin with. At any rate, making sure it was checked and running is what resolved my issue. Maybe it will work for some of you as well.

Perfect, thanks!

The issue has been resolved. Thanks!

I should also mention that I titled the issue wrong. My bad.

Yes, it's still confirmed. Sorry, I've been in active for a long time. This still happens in 1.12-pre6. I'll post a video of this happening soon.

Still happening in 16w04a.

You didn't misunderstand. From what I see, it gets deleted completely.

I've attached a file that should show you the bug in action. Just press the buttons from closest to farthest from the repeating commandblock.

I create a new world every time I test it out.

Still disappears. I'm not the only one with this problem, right?

Doing it now, but it also happens on my other computer as well.

It seems it disappears one tick after I teleport to it, except when I run the testfor command on it. The normal bug is still there, though. So, now we've found two...

Still disappears, but the strange thing is that I saw it for one tick before it disappeared.

And it still was there?

Minecraft Crash Report ----
// Why is it breaking 😞

Time: 9/21/15 8:44 AM
Description: Manually triggered debug crash

java.lang.Throwable
at bab.s(SourceFile:1625)
at bab.as(SourceFile:928)
at bab.a(SourceFile:377)
at net.minecraft.client.main.Main.main(SourceFile:125)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bih.a(SourceFile:361)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bkg['Dorkaloonies'/0, l='MpServer', x=-93.74, y=4.00, z=906.27]]
Chunk stats: MultiplayerChunkCache: 25, 25
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-93,4,906), Chunk: (at 3,0,10 in -6,56; contains blocks -96,0,896 to -81,255,911), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
Level time: 2365 game time, 2365 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 9 total; [yp['Slime'/122561, l='MpServer', x=-121.50, y=4.00, z=892.50], bkg['Dorkaloonies'/0, l='MpServer', x=-93.74, y=4.00, z=906.27], vm['Rabbit'/114279, l='MpServer', x=-118.50, y=4.00, z=936.50], vl['Pig'/114281, l='MpServer', x=-66.75, y=4.00, z=913.06], vm['Rabbit'/114280, l='MpServer', x=-116.50, y=4.00, z=936.50], vl['Pig'/114283, l='MpServer', x=-64.00, y=4.00, z=913.03], vl['Pig'/114282, l='MpServer', x=-71.34, y=4.00, z=911.16], vl['Pig'/114284, l='MpServer', x=-63.50, y=4.00, z=918.50], yp['Slime'/121656, l='MpServer', x=-114.50, y=4.00, z=889.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bih.a(SourceFile:361)
at bab.b(SourceFile:2369)
at bab.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:125)

– System Details –
Details:
Minecraft Version: 15w39a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 128920736 bytes (122 MB) / 265687040 bytes (253 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 15w39a
LWJGL: 2.9.4
OpenGL: GeForce GT 610/PCIe/SSE2 GL version 4.5.0 NVIDIA 347.09, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: Doctor Who (incompatible)
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x AMD A6-3620 APU with Radeon(tm) HD Graphics

Here's the report, not sure if there's anything that will help.

I think you have to teleport it out of loaded chunks. Try 1000 blocks, or more.

[08:32:27] [Client thread/INFO]: [CHAT] Command set: /execute @e[type=ArmorStand] ~ ~ ~ /setworldspawn ~ ~ ~
[08:32:29] [Client thread/INFO]: [CHAT] Object successfully summoned
[08:32:44] [Client thread/INFO]: [CHAT] Teleported Armor Stand to -683.5, 4.0, 684.5
[08:32:48] [Client thread/INFO]: [CHAT] Teleported Armor Stand to -283.5, 4.0, 684.5
[08:32:56] [Client thread/INFO]: [CHAT] Teleported playername to -287.5, 4.0, 684.5
[08:33:07] [Client thread/INFO]: [CHAT] Found Armor Stand
[08:33:16] [Client thread/INFO]: [CHAT] Teleported Armor Stand to 116.5, 4.0, 684.5
[08:33:20] [Client thread/INFO]: [CHAT] Teleported playername to 112.5, 4.0, 684.5

I tested for the Armorstand after, but got nothing. Doesn't say anything.

Where are those? In .Minecraft/logs I assume?

Blank. There's nothing. Even after reloading the map.

Now it's worse... The armorstand disappears on the first teleportation.