After updating from pre8 to pre9 I got this in my logs along with a bunch of tick issues.
[05:57:59] [Server thread/ERROR]: Encountered an unexpected exception
h: Exception ticking world
Before the update there were no moved wrongly or tick errors.
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Comments 3
Could be related to that one "MC-133653" because it did crash when player entered the end but we did not experience this before pre9 and I have not attempted to create a superflat world.
--> MC-133653