For Curator Class VI I needed to get 3 more Stars across my museums. I was working on the 3rd Star by getting the 3rd Star on Wailon Lodge. When I finally got my last needed Famous Spirit and activated their Buzz Bonus, I got the 3-Star pop-up. I closed that notification and then the Curator Class VI pop-up happened. I was not able to close the pop-up. None of the buttons on the controller would close it. I had to force close the game and when I reopened it, the Crate had a Cursed Object and not the Famous Spirit. The Famous Spirit is still logged as received in the Sticker Book. The Star Objectives for the 3rd Star are gone and the Curator Class VI Objective now says I’m back at 2/3 Stars. 

Editing to add: I was able to do another expedition to the same location to get the famous spirit back. The 3rd Star still shows as completed on Wailon Lodge but now I cannot get the 4th Star objectives to pop up. I’ve loaded into other museums and came back and restarted the game a few times and still no luck. I’ve moved on to getting my 3rd Star at Pebberly Heights in hopes of getting the Curator objective to complete again and see if Wailon Lodge will show the 4th Star objectives again. Will add a comment instead of an edit with any additional info