I mean, no, uh, there is one and it is Pixelmon Mash up By Pixels and blocks.
Yes
Im having the same problem as jakobzucker too. I have 5 chickens in a pen, I go to my house then go out and 2 have escaped. The pen is in the same chunk too. I tried putting two fences round it but the chickens glitch in between the fences and get stuck.
Yes