[1.21.1][NeoForge 21.1.95] Why doesn't the useitem event pass a 'hand' parameter?

[SolarMoonQAQ]

I didn't find a way to call hand when using this event., want to know why.🙂

[KnightMiner]

As a workaround, there is always item stack instance comparison. If you have access to the entity, you can check event.getStack() == entity.getItemMainHand() to see if its the main hand item. While .equals() may return true for the item in both hands, the items in each hand are guaranteed to be unique instances.