Oh, this looks like it might be because the calculation is overflowing beyond the allowed range of values for saturation (might be hitting 0 saturation or something like that). I'll look into it - but depending on whether I can make a fix that leaves current Penumbra chickens unchanged, I may or may not update it in the end.
ChickenPet
2:58:53 am
UCT
78
online
2:58:53 am
UCT
78
online