When I start a new world I just see random glitched ice bocks that generate in the sky. They cannot be broken or even be walked on them. When I went underneath one it just disappeared.
This is evidence that it exists
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tqz78
Arisa Bot
Thank you for your report!
We're tracking this issue in MC-227859, so this ticket is being resolved and linked as a duplicate.
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OptiFine mod problem. See MC-227859.
Edit: Reporter's game is also outdated as 1.17.1 has already released and this issue only occurs on 1.17 with outdated versions of OptiFine.