“A prototype needs to have at least one frame...” on combined variants

I read the “A prototype needs to have at least one frame” error post and have to add that this might be a new bug, but I am unable to remove a flow from my current design, because it is a combined variant. I am unsure how it started out, but I have a similar issue as described by Shawn3 in the previous topic, only that I cannot add top-level frames to fix the issue. Or I don’t understand how.

  1. Select the “Frame” tool and create a frame on the canvas.
  2. Drag the “Play” icon from the component set frame to the created frame.
  3. Add an instance of your component to this frame and you can now run the prototype.