The lid of a chest may start Z-fighting with another chest if it intersects with it.
To reproduce:
Place a double chest
Place another double chest in the block it is facing, facing in the same direction as it
Open the chest in front
Observe the part of the chest which intersects with the other as it closes.
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Due to the existence of MC-136695 I'm not so sure about this resolution.

I remain not so sure.

Still not so sure.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-31091.
Appears to affect the chest if block highlighting is used rather than outline, and is probably as a result of MCPE-31091.
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