I could've sworn I reported this issue before, but I couldn't find it. Sorry if it's a duplicate.

I found bright areas underwater that are too deep for there to be skylight.

Reproduction steps:

1. Use seed 3878367825461251210. Worked on both single biome world and default.
2. /execute in minecraft:overworld run tp @s -40.51 53.01 98.90 -139.63 41.37
3. See glitched out lighting