I just plugged in my Chromecast with Google TV in HDMI 1 on my Samsung Q9F 65" (2018). And it takes forever when trying to discover what device it is, after a while it says "Unknown HDMI device". However the device does function, and CEC seems to function (but not all the time, sometimes it does not react when turning off via CEC).
Manual setup does not help either, as Google or Chromecast is not available to select in the list.
How do I setup my Chromecast with Google TV with my Samsung TV, to make it become recognized?