Pain Offering despawns on weapon swap

Title says it all. The bone spike offering created by impaling a minion will disappear as soon as you swap weapon sets. Considering the bone spike is a separate entity from the minion it impales, and the minion is killed when you use it, I would expect that the bone spike should persist even if the second weapon set wasn't using the minion.

I haven't tested this with Bone Offering but I'd assume it behaves the same way.