Object Masks - Unassigned Masks - Disapear Carrort Twril - Open and Close

Hello,  I am using object mask tool, it’s been working well, 15 hours so far making masks. One issue I noticed twice. 

•    Issue:
If I duplicate a track, v1,v2, while the track has an object mask, the option to select the unassigned mask disapears. So you can’t edit the mask. 

What seems to return it, is if I make a new object mask on the clip. The old mask is there, but the ability to edit or see the keyframes get removed.


    •    Steps to Reproduce: A numbered list of the exact steps needed to replicate the issue.
    •    Expected Result: What should happen after the final step? The mask options in unassigned mask should remain as is, selectable.



    •    Premiere Version: 26.2.2
    •    Operating System: Mac Tahoe 26.4 M4 Macbook Pro
    •    
    •    Video Format: mov, proress.

Make a object mask, twirl closed the carrort, sometimes it doesn’t open again.