I have an embedded HDMI port above my fireplace that routes down to the floor so I can keep my mounted tv free of clutter. Both ends of this cable are female HDMI. I am able to get non-4K inputs to stream to the tv without any problem, but when I try to get my Apple TV 4K to stream up there I get a constant flickering and intermittent blacking-out of the signal.

I know both of the HDMI cables I am using on either end of the in-wall section support 4K because I can use either of them directly from the Apple TV to the tv and they work. I also know that all three sections of the cable support 4K in some way, because when I run the display check process on the Apple TV it always lands on 4K HDR and it does work at times, albeit with the flickering and intermittent loss of signal.

Does anyone have any thoughts on what might remedy my issue? Is it a problem that I have three different sections of HDMI between my source and tv and if they aren't all the exact same type they cause problems?