This is difficult to explain beyond what I’ve written in the title, so I made a video demonstrating the bug:
As you can see, I select Tab 2 in the designer then go to select Tab 2 from the tab settings menu. This does not properly load the styles of that tab, and I am required to click away then click back to the tab again to be able to edit that tab’s styles. I focus on the bottom bar style as an example.
Hope this helps.