When changing the brightness to "dark", this lighting bug happens specifically in the dripstone caves.
The first image shows the bug when there is a source of illumination in the dripstone caves, it is in the "dark" glow.
The second shows the same place with maximum brightness.
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Avoma
This appears to be a duplicate of MC-199559, 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.