Hello.
I also have this bug on my community server. After a while the zombies freeze and I have to reboot.
I feel like it's random on the zombie spawn in POI, bloodmoon, screamer and wandering zombies. No link with a particular POI. I have city kick claims during blood and the errors have already appeared in blood when no one was in a POI. I reset the city region files every day and it happens every day, not necessarily in the same place.
Strangely enough, it happened overnight without me changing anything.
I add the logs with the correct line in the title :
output_log_dedi__2020-12-14__13-45-44_Line_1581.txt
output_log_dedi__2020-12-28__16-00-27_Line_4833.txt
output_log_dedi__2020-12-28__16-00-28_Line_24272.txt