Lots of lighting errors underwater. Not just making things dark where they shouldn't, but also making things bright when you place a block in one area, but not other areas. Basically, bright lighting errors are when it is much brighter than the surrounding water, and you can't brighten up the surrounding water, and there is no explanation for the bright spot's existence.
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Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/]/crash-reports/crash-<DATE>-client.txt
), otherwise we can not diagnose this issue.
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but it did not crash. Why is this bot asking for a crash report from a non-crashing bug?

Because there isn't enough information to accurately determine the bug or reproduce the issue. A crash report can provide far more information on the issue than what your description can, and there is a built in key combination that forces a crash.

i uploaded 2 screenshots with a lightning error. the seed for the world is 2952509567251725644 and the Position is 771 51 88

Related to that same bug: MC-128341

I'm having the same issue. Placing torches on a square above water makes a random square of light appear at the bottom of the ocean with no rhyme or reason that I can see. (Including before and after pics.) And after the torch is removed the weird light square stays.
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