II did all steps several times but can’t confirm what you’re seeing.
My menu is not grayed out and I hear no >thunk!< sound.
Instead it’s even worse: going back via menu when a RTF record is displayed reproducibly switches databases over here. Only happens when RTF is displayed.
I noticed something else: When I started to try your steps I missed that you were in the database’s root. I tried it with the TOCs parent group being the window’s root. And there’s a different behaviour: If the group is the window’s root then going back takes me to the database’s root and the selection jumps to the TOCs parent group. This is reproducible too.
I then tried it with nested groups but result is the same: if RTF is displayed it goes “on level up”. Don’t know if this makes sense or is possible but to me it looks like this: if I’m already in the database’s root then the next level is another database. If there’s still “room” it just goes one group level up. Weird
Going back via the path bar and the navigation bar are completely independent, e.g. the navigation bar can be used to navigate after browsing the web. The commands Go > Back/Forward and their shortcuts use the navigation bar if the document has the focus, otherwise the path bar.