When you leash an axolotl, the position of the lead is way too high than it supposed to.
MCPE-123574
Lead is positioned too high on an axolotl
Resolved
Invalid
1
https://www.minecraft.net/en-us/article/minecraft-changelog-1-16-230-52
Known Issues:
Axolotls don't spawn naturally in the world
Leads attached to axolotls float too high above their heads