Thanks for posting in the community — let's sort this out.
A few questions; what music are you playing? Have you tried using another music service and see if that would stop playing? Also, try resetting the device and set up again and see if the issue is still the same. Here's how: https://goo.gle/3G7eoCb's%20resetting.
Keep me posted.
Still a problem. Your Google link in you first note took me to the Google home page but no information. I have tried to tell Google to "Play Relaxing Music Radio for one hour" and it will acknowledge the command and start the music but won't ever turn it off. The same thing if I say, "play ocean sounds for one hour". No acknowledgement but ocean sounds start but don't turn off. I have asked Google to run a diagnostic but it doesn't understand that command.
Thanks for the response and sorry that you are still experiencing the issue. Our goal is to create the fix the soonest. Rest assured that our team is working on this the best they could. We encourage you to follow the main thread for updates.