When you throw a splash healing potion at a living mob, it appears to take damage, its body turns red as if it had been hit, and it moves away from you. This issue does not occur in 1.21.111.
Steps to Reproduce:
Spawn a living mob
Throw a splash potion of healing at the mob
Observed Results:
The mob takes damage.
Expected Results:
The mob should not take damage. Only undead mobs should take damage.
Video:
This bug is also affecting Potions of Harming, if you throw them at undead mobs then they will take damage rather than healing