Seed -6208714676951964381, coordinates 318/64/560, you can see a patch of land at light level 0. Many but not all of these trees are cut out right where the darkness begins, leaving trees that just look split down the middle.
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Thank you for your report!
We're tracking this issue in MC-214793, so this ticket is being resolved and linked as a duplicate.
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That actually happened to me so i can confirm in 20w07a