There is a "standing bug" in this mod. Probably a conflict with some other mods (I'm running quite a large modpack).

Pawn freezes when taking corn for fishing (when "allow grain" is disabled on fishing pier, bug disappears). Logs show rapid cycling of "standing"/"taking to invertory" jobs within one tick.

Most probable conflicting:
Combat Extended
Large stack

Bug still occurs while following mods are disabled (that caused standing bug in the past):
Rimworld Search Agency
Haul to stack