The tool tip for 'Is Hidden Ed' states "Returns true if the actor is hidden in the editor viewports" but it only actually flags true if "Hide Selected at Startup" is selected for the actor. Therefore it shares the exact functionality as 'Is Hidden Ed at Startup'.
Results: Output is 'false', 'false', 'true', 'true'
Expected: Output is 'false', 'true', 'false', 'true'
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-53980 in the post.