I was flying around the End on my unmodified vanilla 1.14.4 server, when it suddenly crashed.
After starting it up again, the server crashed again after a few seconds, it became clear that the server crashed when it tried to load a specific chunk, after many reboots of slowly moving away from the problem, the server stopped crashing, when I tried to return, it crashed again.
I'm not sure if the server is trying to generate a new chunk or load an existing one when it crashes. The map was created in 1.8, so it's possible that the issue is related to maps updated from previous versions, though the chunk in question couldn't have been created earlier than 1.9, when the outer End was added.
I found some similar seeming issues, such as MC-151637, but all I found were already marked as solved.
I attached one of the crash reports, the world save is pretty large (>10GB), so I can't easily provide it, but I will try to find a way if necessary.
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Thank you for your report!
We're actually already tracking this issue in MC-155620, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This has happened to me as well, also on a world that was generated in 1.8. What I did was reset the end chunks and then there were no more issues. Check out this helpful tutorial here: https://www.youtube.com/watch?v=fGlqDBcgmIc