I just tried to reproduce your comment. Google home set a timer for me and play/paused my TV (chromecast with google tv) I don’t have streaming music to test it on. I do agree that the quality of Google home has gotten terrible though. It takes a lot more prompting to do simple things and has stopped some scheduling tasks as far as I can tell.
When I ask it to set a timer, it tells me that it doesn’t understand me. If I ask it to stop playing, it tells me that it doesn’t understand me. I have to just say “stop”. It also used to transfer whatever you were listening to between speakers, but cannot understand me anymore if I ask for that.