I used PlayerInteractEvent to check when a player equips an armor piece that is in their hand by right-clicking it, expecting that the interaction type would be Action.RIGHT_CLICK_AIR. However, my plugin wasn't working so I made it log the action, and I was surprised to find that the interaction type was Action.LEFT_CLICK_AIR.

Before you ask, when right-clicking a block, the action is correctly Action.RIGHT_CLICK_BLOCK.