some axolotl will die after 5 min when on land or air
most of my axolotl just died after i puted them in a cage but the only way to make them don't die is putting water near them
also naming an axolotl '' exciton '' they will despawn if you go far
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And the other part is just a duplicate of MC-228858.
This is intentional. Axolotls are aquatic mobs and require water in order to survive.