Spectrum TV tvOS app forced Apple TV out of HDR mode
If an Apple TV has the video setting Format set to "4K HDR" and Match Content set to "Off" (as are the default settings), all video content should be up-processed by the Apple TV into HDR content for the television. This is indeed the case with all other apps on my Apple TV (including apps that don't natively provide HDR video content) except for the Spectrum TV app.
When opening or switching to the Spectrum TV tvOS app, the app always causes the Apple TV to automatically revert to an SDR signal, which in turn forces my TV to flicker and change mode to accommodate the non-HDR signal as well. This forces the TV to change mode when switching to and from the Spectrum app with any other app or the Home screen. How can I force the Spectrum app to allow the Apple TV to remain in HDR mode?