So... I moved to the Twilight Forest. I'm very much a cat person, so I took two kitties with me and started breeding them to re-create my overworld kittycat army.
Only... the two I brought from the overworld are fine, but any babies I breed out of them just disappear unless I growth-vaccine them to adults. Does the Twilight Forest not like kittens? I can't for the life of me find anything that'd be hurting them (no hostile mobs and no dangerous plants nearby) and the area's covered by a chunk loader. They were told to sit, too, so they couldn't really have followed me...
edit: Oh man I just realized I spelled Twilight wrong in the title