The unique dagger Drought’s Release has the affix “% missing health regained on potion use” and based on the wording, sounds like it should work when a potion is used indirectly as well. Other instances of this wording works when i use acid flask while having elecoes abandon on but this does not trigger. This might be intended but figured i would bring it up.
The chest consumes a potion, it’s not you using a potion. Just like if there’s a proc or passive that consumes mana that wouldn’t count as you using the mana for other effects.