I've tested in Creative to check if everything works, and so far all of the dinosaurs I've checked out except for Mosasaurus will eat. I saw that it can't eat from the feeders, and it was hunting squids, but it's hunger wouldn't go past 1. Then I tried to spawn Alligator Gars, and it wouldn't even try to eat them. I don't know if this has a fix, or not, but I haven't seen this issue submitted yet, and if it does have a fix other than disabling hunger, I'd appreciate if someone could tell me.