The Bug
Picking up a baby axolotl that has been fed a Golden Dandelion doesn’t save the AgeLocked nbt tag, causing the axolotl to grown up.
Reproduce
Get a baby axolotl
Fed it a Golden Dandelion
Pick it up in a bucket
Place it back down
Do /data get entity on the the axolotl
Observed Result
The AgeLocked nbt tag wasn’t saved
Expected Result
The nbt tag would save
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.