The bug
Potions of harming damage all living animals. Since corals are animals, one may therefore expect that throwing splash potions of instant damage of them would kill them and cause them to transform into a dead coral block. This does not happen.
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Comments 17
This is a feature request. Corals are a block, not an entity at the moment, so adding this would require creating new code for this "bug".
Plus, corals aren't exactly animals. I'm not even sure it makes sense for harming to affect them.
Corals actually are animals; just not mobs in-game.
This is being left open for mojang to decide for.
I'd also like to point out that there is already a case of splash potions affecting blocks in some manner: water splash potions removing fire blocks.
It isn't same as putting off a fire. That would also require splash potion harming grass or other plants, since they are "alive" too. But in the game code, they sre just blocks. So, your "bug report" makes no actual sense, since it's not a bug.
I agree. This should be a feature, but this isn't a bug.