Forced to AirPlay to Apple TV and stereo pair HomePods from some apps
I've got 2 HomePods connected as a stereo pair and set as default audio for my Apple TV 4K. While working I like to stream music from my iPhone to the speakers with the TV/Apple TV off. Whenever I open Facebook, the Apple TV app, or YouTube TV, I get a prompt saying that the content will automatically play on the Apple TV.
There is an option to 'Play on iPhone', but it is ignored when pressed. In Settings > General > AirPlay & Handoff on my iPhone, I've got "Automatically AirPlay to TVs" set to "Never". This is apparently also being ignored.
Note that the Facebook app only recently started doing this, but it has always been the case with the Apple TV app and YouTube TV (and some other video streaming apps like Disney+). This is NOT the case with Netflix. With Netflix I can stream music from my iPhone to my stereo pair HomePods and play Netflix w/ audio on my iPhone w/out issue.
Any thoughts on this and why some apps work and others don't?
iPhone 11 Pro