i was testing with potions, i used a harming lingering potion on axolotls. and i saw they didn't get any damage.
Steps how to reproduce:
Spawn Axolotl
Throw lingering potion
Done.
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I can't reproduce this, except if you throw it on top of their head which is just MC-88368
Oh, I see now. This is actually caused by MC-110648, since the axolotl hitbox is so short, sometimes the cloud spawns above it even when thrown directly onto the ground
Can confirm