Indeed, and if no such call was made, their flavor of Android must be assuming the buttons should be there (which explains the random behavior as to if it acts as fast forward, or video forward…or nothing at all).
I love Android don’t get me wrong, but it’s the flavors of Android that make things weird at times. I’m glad I’m on AOSP as I can test what “naked Android” should behave without OEM stuff added on top, as it clearly exposed intended behavior (which I think your phone was correctly assuming, but I guess yours has some OEM stuff to show the buttons anyway tapping Media Output, but AOSP Android has no such thing).