Above a certain Y level, the light level of blocks darken.
This Y level seems to vary based on how high the blocks are when you load the world. When I generate a world, it's usually around 175, but when I leave and reenter the world near my tower, that height increases.
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Thank you for your report!
We're tracking this issue in MC-236633, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I believe this is the same bug as MC-26633. I did search awhile ago, just spent awhile creating the issue as I was experimenting with it.
Can confirm.