Repro Steps:
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.

*Observed result:
*Water splash potions don't give the axolotl 1.5 minutes of moisture. Other sources like Water, Rain and Bubble Colums fully moisturise Axolotl.

*Expected result:
*Water splash potions also give the axolotl 1.5 minutes of moisture.