I have a pulley system with an expandable piston to move it back and forth. When server is lagging, if you move this the pulley may continue moving even if it isn't attached to gearshift due to piston pushing it off. This results in lagging the server out until it crashes. Even if the original source of lag was gone, if pulley is loaded in the server will crash within minutes. The first time I'd try starting server to break a block each crash until it was gone, only actually fixing issue by removing pulley from world via Amulet world editor. The second time pulley isn't moving at all, yet these chunks continue to murder the server ~ trapping anyone in range.

(Create 3.0 ~ Forge 35.1.28)

I wish I understood more fully to better convey the issue, only solution now is to delete the pulley whenever it "breaks" & basically never use it unless there isn't anyone exploring. In crash log I couldn't find anything about the create mod just that the server was lagging.

crash-2021-02-07_06.34.17-server.txt

Removing the quark pipes, pulley & portable storage interface fixed the issue the second time, this report is too frantic & unhelpful so I'll close it, if I can figure out exactly what is causing the issue later I'll open a new one.