I updated my world from 1.21 to the new snapshot to experiment with the happy ghast, but when I updated, there were very laggy, gray, spiky things in the sky. My world is a custom superflat. I went into the new version, updated my world (with a backup), turned off the rain and night that was going on and then I saw them.
Superflat world, top layer sandstone, 100 blocks of air, sandstone at bottom. I had many redstone builds but none active besides a chunk loader.
The Environment field is supposed to only contain PC details.
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We are tracking this issue in MC-296843, so this ticket is being resolved and linked as a duplicate.
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