I was getting out of a betweenlands boat,

https://gist.github.com/ProsperCraft/c9550b9b8a3737116f8e867347f0f167

https://minecraft.curseforge.com/projects/ancient-towncraft

Reproduced here - https://paste.dimdev.org/ufopetelik.mccrash
https://paste.dimdev.org/ahogeqabut.mccrash
https://paste.dimdev.org/xuxayugoza.mccrash
https://paste.dimdev.org/utodimotax.mccrash
No crash on exit.
then crash by another player death- https://paste.dimdev.org/gitiyeloxu.mccrash
No crash on exit
https://paste.dimdev.org/azugawirex.mccrash
https://paste.dimdev.org/nibuqusequ.mccrash
https://paste.dimdev.org/epoyiyujip.mccrash

Should be fixed in the upcoming version.