Reaper Rewards week 5: Can't undo turning other Sims into ghosts

I made the new spectral spritzer for other Sims and it had the desired effect of turning other Sims (not in my household) into ghosts as well. I thought it was temporary, as it is for my Sim, but it has been more than 8hrs in game and these Sims are still appearing as ghosts. Even when I go in to play in those households, they are still ghosts and I cannot find a way to undo this. I think this is a bug with the Reaper Rewards week 5. Please help if anyone else has had this same issue.