BUG or BAD-DESIGN: Layout can't remember to display TOC panels

I'm pretty sure this is L10-era; I don't remember this being a constant problem before (before meaning back to L4). Latest Verbum; latest macOS.

One of my layout windows, I keep my main dictionaries for quick access.  And I keep their TOC's showing.  In theory, saving the layout should remember the TOC's setting.  Below is just an example of the layout window; not the real one; I was just testing any set of dictionaries.

Currently, if you save them with their TOCs open, and re-load the layout, only the displayed tab will have the TOC open.  The non-showing tabs won't.  So, one by one ... open the TOCs.  Mr Powerful can't remember.

I checked to see 'the principle'.  The key for bad-boy behavior is non-displayed tabs.  

Now, the TOC's also have the other new bad behavior. When the software opens a book (from library, or maybe a search), it doesn't update the TOC location.  So, sure enough, you have to scroll to see where you're at.  Mr Powerful is helpless. L10-era.

Yes, I agree this is software bad behavior, and a bit frustrating.  I just checked my reading layout and only, as you said, the TOC for the displayed tabs are still open, but the non-displayed tabs have closed their TOC.

I assume a BUG as previously the TOC, if open, stayed open.  Past behavior when the open TOC was not respected that was fixed as a BUG.