When you are standing in very dark place, surrounded by blocks, and try to look up, you will see many pixels of sky in random places. Same pixels always appear in same aim position.
I remember the same issue in older versions of minecraft too.
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wobst.michael
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
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Crash report is attached.
wobst.michael
Please check if that's still an issue for you in 1.15-pre1.
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It is still an issue for me in 1.15-pre1.
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wobst.michael
Actually this is a mild appearance of MC-1794.