When I use the same bookmark group for different bookmark navigators on a page, I encounter a problem. If I select a bookmark on navigator A, it shows the same state for navigator B. However, if I navigate to a different page and interact with the bookmarks, upon returning, I see the correct state for navigator A and the default state for navigator B.
This is a known limitation of bookmarks as they stand now.
To ensure that we're consistent with the last-button clicked remains active regardless of other actions taken, this is expected behavior due to the noted behavior change. The bookmark navigator remembers the last button that was clicked.
The PG team is looking into planning an upcoming scenario that would fix this limitation.