Expected (in screenshot): The floor is not hit with light level of 15.
Actual: The light level of the room is 15.
To Reproduce: Make a room similar to one pictured at y=138. (Make sure that it is daytime.)
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What am I looking at?

The lighting in the room is not supposed to be 15 everywhere, but it is. Note that this is not merely a visual bug.
Duplicate of MC-911, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.