Currently only tested on 21w07a.
Long strips of random lighting appearing commonly in the new snapshot 21w07a.
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Avoma
This appears to be a duplicate of MC-214793, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.