I brought a Tallbirg egg to Hamlet from Shipwrecked and attempted to hatch it. All went according to plan up to the point when Smallbird grew into a Smallish Tallbird/Teenbird. The Teenbird was following me but is now unable to leave the Slanty Shanty, no matter the distance I travel without him, he does not want to join me and remains in Slanty Shanty. He does continue to lose hunger and hp there if not fed.
It wasn't an issue for smallbird stage. Smallbird could enter and exit slanty shanty freely. Teenbird may be too tall to squeeze through the door
1. Hatch a tallbird egg 2. Feed it and wait till it becomes a smallish tallbird 3. enter a slanty shanty 4. smallish tallbird will enter as well but will be unable to leave