i recreated this on the same version and it seemed that it would reset the age of the baby axo causing it to stay a baby. (the age count would reset to -2400 under the mentioned circumstances). hope this helps.
there was some issue with the post formatting that i only just noticed, the video link should be there now.
I tested this on snapshot 5, 4, 1.21.11, and 1.20. Everything described in the report showed up in all of these versions except for 1.20, where the dog wouldn’t sit at all. hope this helps.