Shipwrecked compatible RoG world
At about day 180 I can no longer feed pigs. When I hover over them holding the food, no interaction text comes up and clicking does nothing. When not holding food, left click only gives me the option to attack them. They are not hostile to me. I've not tried this on multiple pigs in multiple areas. I've verified the integrity of the game files (in steam) and restarted multiple times.
EDIT - I killed all of the pigs in my world and when they re-spawned I was able to feed them again.
I didn't do anything out of the ordinary. The change happened to come just as winter turned to spring in the game.