When a tipped arrow has an instant effect, for example healing or harming the effect is not applied to the shot mob or player.
How to reproduce
Prevent you from regenerating automatically, for example by using the following command:
/gamerule naturalRegeneration falseUse the following command twice
/summon Arrow ~ ~5 ~ {damage:0.5d,player:1b,Potion:"strong_healing"}
You will see that you only take 0.5 damage but don't get any health back
Linked issues
Comments 3
You are right, I searched for "tipped arrow" and apparently that report does not mention "tipped" anywhere...
Dupe of MC-91728