I have encountered this very weird z-fighting issue in Minecraft 1.21.4.
Steps to reproduce the issue:
Upgrade a superflat redstone preset world with blue concrete layer set instead of stone layer from 1.21.2 to 1.21.4 and fly 10 or more meters high.
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Duplicates MC-234358 🙂

I think it's a rendering error, not a z-fighting error, but do you know if it works with other concrete types?

Thank you for your report!
We're tracking this issue in MC-234358, so this ticket is being resolved and linked as a duplicate.
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