If I click on a script name in the left sidebar in the main Script Workspace window, if that script is already open in a Script Workspace tab, the focus switches to that tab. This is expected.
If, however, I moved that script to a new window, the focus does not switch to the window when I click on the script name in the list. If the window for that script is in the background, it looks as though FMPA is doing nothing. (Even if that window is visible, it doesn't appear to be brought into focus)
I think the expected behaviour would be to bring the separate script window into the foreground.
If I double-click the script name in the list (which I'm inclined to do because clicking on the script name didn't yield the expected results), it closes the window I had open and opens the script in a new tab in the workspace. (Thankfully while preserving the state and unsaved edits).