My problem is still this.
A month has passed and it has not been fixed.
I repeat, I do not use any modifications.
I checked in administrator mode and it seems that the problem is not the pens, it is the baby animals. I tried different types and saw that some did work and some did not. I took hatchlings from the map and they don’t work, only hatchlings I summon in admin panel.
By the way, I play on the map of The Isle of Siptah