21w11a, 21w13a, 21w14a
1. Create a new World in Creative mode with Caves and Cliffs toggles on.
2. Obtain Axolotl Spawn Egg and Splash Water Bottle.
3. Spawn Axolotl by Spawn Egg and wait for 4 minutes and 30 seconds.
4. Throw Splash Water Bottle on Axolotl.
5. Wait another 30 seconds.
6. Observe the issue.
*Water splash potions don't give the axolotl 1.5 minutes of moisture. Other sources like Water, Rain and Bubble Colums fully moisturise Axolotl.
*Water splash potions also give the axolotl 1.5 minutes of moisture.