implicit PR attachment shows when PR is already attached

1. open PR view
2. attach the PR using implicit PR attachment
3. :bug: After a couple of seconds the implicit PR attachment shows again

(Clicking the implicit attachment is a no-op)

<img width="469" height="213" alt="Image" src="https://github.com/user-attachments/assets/c9c3a322-b295-4e21-a179-dd19e652f8d1" />