As of 1.18 Pre-release 4, the issue seems to be fixed
The bug:
A mob falling through the end portal causes a game crash. The world has a chance to crash again, this is not always the case and the world might be playable after reload.
How to reproduce:
Find or make an active end portal
Drop a mob or minecart through the end portal
Linked issues
Attachments
Comments 2
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We're tracking this issue in MC-241775, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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I believe this is a duplicate of MC-241775 which has been fixed in 1.18 Pre-release 4, since the stack traces in this report and MC-241775 are almost identical. As an additional note, I cannot reproduce this behavior in 1.18 Pre-release 4.