This bug might be triggered by something, or it may be completely random. At least, I can say it isn't triggered by the nether.
Steps to reproduce :
-Play the game normally
-Keep playing until it happens
To go back to normal :
-Close the app
-Kill the process
-Reopen the world
Device : "Soshphone 4g"
Generic ZTE phone
Android 4.4.2
Everything below this line may be unrelated to the bug
-What I did :
-I placed 30 boats in the nether using MCPE-14345
-I entered the nether. The game crashed, but I didn't think this was worthy of a bug report in itself, because it seems to have already been reported. Plus, it often happens without the last part of the bug.
-I reopened the world and entered the Nether.
Steps to reproduce :
No idea. I tried to do it again, but it didn't work.
What I expected to happen :
I would be in the Nether
What happened :
-Netherrack looked weird in a radius of about 16 blocks
-I placed a redstone torch, and it looked strange too
-Going back to the overworld didn't fix anything
-More blocks were affected (white clay was red, droppers had a black face, cobble had a bad texture...)
-After leaving the world and coming back, everything was normal again
Linked issues
is duplicated by
relates to
Attachments
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Does this still affect 0.14.3?

Yes, it does. It happened quite a few more times since I reported it. I'm going to update this report when I have time.

The bug happened 3 more times.
First time (6 screenshots) : nothing remarkable, items textures change in the world and the inventory. This shows it wasn't linked to the nether in any way.
Second time (3 screenshots) : lilypad texture turned into ice and rail turned into melon.
Third time (4 screenshots) : the snow used in my base turned became that cool looking green block. Shadows seemed to appear. As you can see, the effect partially stops after a certain distance. The cake turned into a maki block.
I am afraid we can not reproduce this bug in the recent version. Please update affected versions if this bug still occurs.

I'm not playing 0.15 yet, it is way too buggy. I'll make sure to reopen this report if the bug happens again.

Affects 0.15.1 build 1. Galaxy Tab 4 Android 5.0.2

If it is of any relevance , torches, particularly redsotne ones, seem to get hit the most with this bug.

Reopened.

um david this isnt the bug that is a not a dup its a diffrent type grass blocks have potion arrows in them so thats a lie

Please respond and add the current version if you can reproduce this issue.

Still affects 0.15.4 but it happens a whole lot less.

Does this bug affect 0.15.9? If so please respond.
This ticket has been resolved as 'Cannot Reproduce' as it has no response was received recently.
Could you please put in the description the device that is affected?