I was out adventuring when I found these really weird light glitch patterns very annoying as they spawn mobs from them I don't know what causes them. I have only been able to see these 3 so far but there might be more. They just spawned and seem to be not connected as when I tried getting rid of them it proved to be difficult ( Only a few blocks would get updated at a time I gave up trying to remove them).
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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.