I have no idea what I did wrong. I went exploring to find a mesa biome to get some red sand.
And now my server contantly crashes until I teleported myself to the spawn using the server console in the small time window I have.
I hope the crash report helps!
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This is the server watchdog
which kicks in because the server runs out of memory:
Maybe this is a similiar issue like MC-129492.
Assign more RAM and report if the issue is persising.