Axolotl's render incorrectly based on your head rotation. Check the images.
The issue:
Axolotl's when alone in the water, won't render any axolotl's that are under the water.
How to replicate:
Turn entity shadows off (Possible with them on, but happens much more frequently when they are off)
Spawn Axolotl's in an enclosed area of water.
Try changing your position and head rotation
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Duplicates MC-197328