[MCPE-11867] Snow blocks exposed to the sky disappear in snowy biomes

If a snow block in a snowy biome is exposed to the sky, it and any snow blocks beneath it will eventually disappear, the uppermost being replaced by a stack of snow layers. It has been suggested that this occurs only during or after snowfall. This information fits with most current observations, however, they may also be replaced following the unloading/reloading of their chunk.
For ice plains spikes biomes, which generate snow blocks in the place of grass, this happens immediately upon generation (or upon reloading a world last opened prior to 0.12.1).

Shown is a player-built igloo in an ice plains biome (old-type world), before and after the snow blocks were replaced, in addition to a newly generated ice plains spikes biome (infinite world).
All snow blocks in a chunk appear to be ticked at the same moment, assuming the required conditions are met. It also seems as though nearby snow layers are regenerated during any occurence.

Update by @unknown
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).
Please avoid duplicate comments. Post only NEW information regarding this bug.

Linked issues

is duplicated by 6

MCPE-12119 snow blocks/ golems vanish Resolved

MCPE-12475 Snow float and grass block didn't spawn in Ice Spikes Biome Resolved

MCPE-13297 All player built snow deleted in a chunk Resolved

MCPE-13958 Snow disappeared in snow biome Resolved

MCPE-14023 Snow Blocks got broken during snowfall Resolved

1 more links

Attachments

Comments 18

[Mojang] Mega_Spud (Jay) 2016-01-21T20:57:04Z

Heh, I wish I had known this might happen.

Just lost a fairly large snow structure to this bug.

Playing 0.13.1 Windows 10 Edition (PC)

BroMiner 2016-01-22T01:01:39Z

Confirmed for 0.13.1 on iPhone 5s iOS 9.2

steve 2016-02-10T01:42:15Z

Still in 0.14 beta. Really worried this won't be fixed by the update. For me, it happens when its snowing.

Luis Robles 2016-02-10T04:10:50Z

Yeah, but this issue is from an iOS device, let's wait if this gets fixed

monkeybee 2016-02-10T14:05:27Z

allready reported ( MCPE-12119) it happening on mine and my dads tablets and where using samsung galaxy tab 4 ...thats not an ios...

8 more comments

steve 2016-02-10T14:30:19Z

Even if its from an iOS device, if its not fixed in the beta its probably not going to be in the main update. Most bug fixes happen in the update and I have the same issue with an android device. If they fix it now, itll be working when they port the game to other stores.

steve 2016-02-11T01:33:57Z

also on the android devices 😞

mike 2016-02-11T01:36:42Z

hope the devs fix this soon!

Azelef 2016-05-06T10:06:34Z

So this bug can destroy a snow structure of any size, it makes an entire biome less beautiful, and it is still in the game after 6 months...

My theory (not supported by any source code) :
Since snow layers can stack when snowing in MCPE, huge stacks of snow can appear after a while. To avoid that, the devs decided that if a snow layer is on top of full snow layer block, that block should disappear at the end of the snow fall (as if the snow collapsed). Unfortunately, they checked for full normal snow blocks too.

[Mojang] Mega_Spud (Jay) 2016-07-26T12:26:53Z

Still an issue as of 0.15.3. Tested on Android Samsung Tablet.

tcole379 2016-09-05T12:18:03Z

0.15.7, still an issue, I hope this is fixed soon, I built a huge snow igloo and it disappeared (twice)

Adrian Östergård 2016-09-20T11:58:47Z

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

gatharian 2016-11-13T04:51:48Z

Does this bug affect 0.16.1 or 0.17.0.1? If so please respond.

monkeybee 2016-11-13T17:24:33Z

it appears to be fixed when chunks loading/ unloading but not when the rain stops
tested it by building snowblocks making it rain then jumping in a bed and the snowblocks was gone

[Mojang] Mega_Spud (Jay) 2018-01-03T14:46:15Z

This ticket has been resolved as 'Cannot Reproduce' as it has no response was received recently.

Jeff bezos 2022-02-19T18:09:06Z

Apparently it still occurs as of 1.18.12, I just had all the fallen snow around my base disappear after I came back from the nether. Although the player placed snow/snow layers stayed

TranAran 2023-09-21T01:28:23Z

1.20.30 Switch OLED, Game Card

Thumbnail of the world still shows full snow layers.

Now it's a random mess of varied layers (as if it snowed for the very 1st time in these chunks) when I log in to check my backup worlds.

Timer RP 2023-11-18T22:58:14Z

Issue with snow blocks solved, still affects snow layers.People who to experience with snow layers this can go to the report MCPE-150476.