I, the DM, made a trap that when touched, casts teleport on the creature or object that touched it to move them to a new area. The players suspected the trap, and experimented with objects first and found that it teleported those as well. A wizard then tried to activate it with mage hand.
I allowed the hand to trigger the teleport spell and I interpreted the result as the trap teleporting their mage hand. The players protested, and we didn't come up with a clear answer on what should happen to the mage hand as a result of the teleport spell.
Would the result change if the players could see where the trap was teleporting to?