hmm. CentOS is pointing to a 404, so I can't install it right now..
I managed to strace it, altough I'm not sure it helps. The log is rather large, so I uploaded it: https://mega.nz/file/Y7higI5B#LVnpeGtCkUswOlXXjKW5CnNiLNm4iIdfInBS8fNNzIE
I also managed to find a coredump from systemd, if you want,I can send a link... it's 290MB, though.
I can see messages like this, using journalctl -xe:
Stack trace of thread 548078:
#0 0x0000000000665ee4 ExecSubPlan (/usr/pgsql-13/bin/postgres)