While raiding an ocean monument, I attempted to parry the attacks from the guardian mobs. When I got a successful parry, the game froze for several seconds before crashing.
crash-2024-12-03_22.27.07-server.txt
latest.log

The fix should soon be available on Curseforge and Modrinth.

One more thing, in case anyone experiences this after x.3.1 versions: frycparry:counterattack has to be in avoids_guardian_thorns tag, otherwise it will keep crashing due to guardian's thorns being parried and counterattack effect being reapplied infinitely.