iOS 13 grouped accessories issue
iOS 13 (currently in beta_ now groups accessories in the Apple Home app.  Seems like it is probably if it is the same Serial Number.
This breaks the 'Main TV' tile if you add any switches. It will include these switches and then not correctly display the current App.

The solution here would be to make it so that switches no longer use the same serial number, but rather a unique uuid or perhaps <ip address>_<switch index/number>.