Sam, have you tried deleting your player dat in world/players (or wherever those server files are)? That fixed it for me and I'm interested to see if that works for others.
This is not a duplicate of MC-61535, considering I am able to produce the issue without breeding, and considering that the issue goes away when deleting player data.
Sam, have you tried deleting your player dat in world/players (or wherever those server files are)? That fixed it for me and I'm interested to see if that works for others.