So I have been reading the patch logs for Minecraft and even though it says it has been fixed it is still an issue, when naming an axolotl with a nametag and setting them in an enclosure (that has been safely made) they still despawn, I have been doing tests and even in areas with or without land and such they still despawn with a nametag. I haven't been able to put any of my pet axolotls free for at least the two updates so I am just wishing it gets fixed because I finally got a blue axolotl and would love to set it free in a beautiful enclosure!