I found a lighting glitch over a chunk border, the seed is 1206544250051331767, the coordinates are in the picture. The bug didn't recreate itself when I went back into the world so I have no idea how to recreate this.
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We're tracking this issue in MC-199952, so this ticket is being resolved and linked as a duplicate.
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My current theory is that the dark chunk was loaded in before the light chunk was, and it caused the lighting to be loaded in in the wrong order.