No Frame names visible


I came across a problem, I couldn’t find a solution. I have a file with different pages. In every page I can see frame names except in one page wehre all frame names are missing (see image) I was searching for this but only found resources asking for a on / off possibility but in my case the names are just not showing. Any idea how I can bring those back? Thanks.
Screenshot 2022-07-27 at 11.52.36

There’s a couple of possibilities I can think of:

  • The name of the frame is just a whitespace.
  • A bigger frame encompasses the smaller frame. Child frames don’t have visible names.
  • Frame has been converted or flattened or something, so that it’s not a frame anymore.
  • Background color is the same as the frame title.