Axolotls attempt to pathfind towards unreachable water, then start spinning, eventually drying out and dying

Relates to MC-208662

This can also be observed when an axolotl is on top of a lily pad. It tries to reach the water beneath the lily pad and starts spinning in the ground (see MC-128586).

The same happens if the axolotl is on top of a waterlogged top slab (see MC-208767).

I can reproduce a similar bug. If an axolotl is attempting to pathfind towards a player holding a bucket of tropical fish, the axolotl starts to spin. I am unsure if this should be put in a separate report, but it is likely caused by the same issue. I have attached a video: 

@unknown, that looks like a separate issue worth a separate bug report in that axolotls always start spinning when they cannot pathfind. This bug report is more about the fact that they try to pathfind towards water through walls / obstructions. I think it's probably best to separate these two issues.

Can confirm in 21w03a.

Can confirm in 21w17a. I've attached a new video. Hopefully, this clears up any confusion. 

It's worth clarifying that this does happen even without barrier blocks

Not fixed in 21w20a. Axolotls don't spin anymore, but they still try to reach unreachable water sources, even when there's other, reachable water nearby. They still die from this. I attached an image of this in the new snapshot, the Axolotls will kind of wander back and forth next to the 2 block tall wall.

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New bug report → MC-228464