Rarely while exploring in the new snapshot I'll come across these off rows of darkness, they appear to have no source as no blocks are above the area whatsoever. Updating the blocks does not get rid of it either, not really game-breaking but certainly something worth looking into before the full release comes out.
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I also found something like this. a few times in some ocean biomes and a fields biome. the lighting didn't seem to update after the chunk/s generated. The one I found in a fields biome was three chunks long, and the ones I found in the ocean biomes were diagonal of each other each taking up an entire chunk. One was only half lit with the border between the lit and dark sides going from one corner of the chunk to the opposite. However, I didn't see allot of these. it could be from flying fast in creative which made the chunks generate faster, and causing lag.
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Duplicates MC-214793