Crook's Hollow Vault key bug

This is the second time in a short while were we have encounter a key already in use in Crook's Hollow. When no one is around and the key wont dissapear. The door to the vault is also closed. We tried to leave the island and come back 5-10 min later and the key was still in use. This is making the Vault Voyages annoying as we cannot use the vault key.