This bug happens whenever you have a sticky piston repeatedly pushing a block and you have vibrant visuals on. Without vibrant visuals, no visual bugs occur. This only works when there are no lights nearby, otherwise it just becomes black. If you have a piston repeatedly pushing, easier with two observers facing eacother, you can see a brown tint on the block, easier seen with blocks like white wool, white concrete, etc. When it’s daytime, the block also becomes black.
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This issue is tracked at (MCPE-136928).
Would MCPE-206165 describe your issue?