In pre-release 3, some animals have NoAI:1 even while playing the game.

Clip from my stream where all the chickens around spawn had no AI: https://clips.twitch.tv/HorribleKitschyAntelopeKappaRoss-vZRcn_ZeTSUMv84Y

Also ran into it with a group of cows in a later run.

Until the next release, not automatically starting pre-generation after generating a card should work around this issue, although I suppose there is a chance this issue might occur even with this setting, though it should be rarer and never happened during my testing.