A creature receiving Instant Damage and Instant Health from a source other than a command cannot be detected through NBT checks or predicate checks.
For example:
Use a repeating command block to execute this command:
execute as @e[nbt={active_effects:[{id:"minecraft:instant_damage"}]}] run say magic damageIf the player drinks a potion of instant damage at this time, the player will not say "magic damage".
Comments 2
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This seems more like an implementation detail than a bug. Storing this information in NBT and then immediately removing it would incur a performance penalty and would have no benefit other than enabling this specific behavior. If you want to detect when a player damages or is damaged by another player or mob using splash harming, the
entity_hurt_playerandplayer_hurt_entityadvancement triggers will work just fine. To detect mob-on-mob splash harming, assuming you don’t care about player statistics or mob loot/XP, modify theOwnerof the splash potion to be a player’s UUID and useplayer_hurt_entity.