The bug:
Minecraft 1.18 snapshots / RC1 Ugly striped clouds.
How to produce:
Just create a new world and look at the sky.
Q: This strange appearance occur because my GPU?
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violine1101
Thank you for your report!
We're tracking this issue in MC-161913, so this ticket is being resolved and linked as a duplicate.
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I think you should check your GPU driver.