Reduce Volume of Sonos

I have setup Smart Home Monitor. I use Sonos to play Audio Notifications. My Sonos is normally set to 40% volume to play music
In Smart Home Monitor, I have set “Temporarily change volume” to 90%. I found that this is NOT temporarily and the volume stays at 90%. This happens if the notification interrupted music AND also if it doesn’t interrupt but I start playing music on Sonos later
Any have any comments on how to address this? Or is there an app I can run automatically after Smart Home Monitor to set the volume back to where it was?

Report it to ST support, sounds like a bug.

I did and they asked me to call support. I will try that