Alarm is triggering previously grouped speakers

During the day, I usually have a playlist from my library setup to play in three rooms -- Office, Kitchen and Master Bedroom.  Around supper we usually pause that playlist, and then watch TV. 

At bedtime, I have another alarm (do not include grouped rooms) that is set to trigger a playlist in the Master Bedroom only that plays a small “silent” playlist, basically in order to clear the queue (since my other automation s/w seems to ADD to the playlist, but that’s another issue) before my 10:00pm “Night Night” playlist starts.  Whenever this 1 minute alarm triggers, the other two rooms start up again and continue playing where they left off.  Obviously this isn’t what I want.

I can fully replicate this on demand so it isn’t just a fluke.

Any ideas on this “bug”?

My systems consist of this…

Associated Product: 192.168.1.181
---------------------------------
Play:3: Kitchen
Sonos OS: S2
Version: 12.2.1 (build 61183170)
Hardware Version: 1.8.1.3-1.2
Series ID: A100
---------------------------------
Play:1: Living Room
Sonos OS: S2
Version: 12.2.1 (build 61183170)
Hardware Version: 1.20.1.6-1.2
Series ID: A200
---------------------------------
Play:1: Master Bedroom
Sonos OS: S2
Version: 12.2.1 (build 61183170)
Hardware Version: 1.20.1.6-1.2
Series ID: A200
---------------------------------
Play:1: Office
Sonos OS: S2
Version: 12.2.1 (build 61183170)
Hardware Version: 1.20.1.6-1.2
Series ID: A200
---------------------------------
Play:1: Rec Room/Garage
Sonos OS: S2
Version: 12.2.1 (build 61183170)
Hardware Version: 1.20.1.6-1.2
Series ID: A200
---------------------------------
 

Thanks for any suggestions.