It appears that 2D block textures mirror in x and z directions while still retaining unmirrored texture, creating some z-fighting. I have a few screenshots of the most prominent examples in the nether.
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Duplicates MC-219985 Read for potential fixes.
violine1101
Thank you for your report!
We're tracking this issue in MC-219985, so this ticket is being resolved and linked as a duplicate.
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Cannot confirm, too inconsistent and I don't have the patience to watch for` it that long.