I am encountering some weird lag issues that only occur in flatland, where mobs will act very slow and the sun goes back to it's original position. I have posted a video below showing this bug.
https://www.youtube.com/watch?v=K5Q5RZOz7Kw&feature=youtu.be&channel=OnmateMinecraft
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galaxy_2alex
migrated
Duplicate of MC-58120