Idk why it crashes, only I know that it crashes when I fight a mob but isn't all time, its sometimes.
This is the crash log if it helps.
crash-2021-05-22_20.45.59-server.txt

I am getting the same problem here, my game crashed each time the guradian is summoned by the zombie, it corrupted the world data.
crash-2021-05-28_11.38.51-server.txt
Also I am playing with lots of mod ,maybe incompatibility ,is there a way to disable the guardian summoning ?

I don't know, maybe it is possible, but I think the developer should know what to do or should do it.

try without optifine

To disable guardian summoning via config file
#Treat SWIMMRIDE flags as whitelist
"Boat Whitelist" = true