HomePod mini Alarm Playlist - broken by March 2022 update?

I have an alarm set for 07:30 each morning and plays my 'wake up' playlist on shuffle every weekday morning.

The playlist is a selection of 75 songs from Apple Music subscription that I find nice to wake up to.

It has been working fine for over a month.

I updated the HomePod mini software, and the next morning things are not working as they should.

The HomePod mini still starts playing music at 07:30, except the wrong playlist is being used. I have discovered that it is continuing the last playlist to have been played, or just shuffling songs from my entire music library.

Of course I then checked the alarm settings, deleted the alarm and created a new one, and ran a few tests with an alarm a few minutes in the future to see what it plays.

I also tried setting an alarm with a specific song (rather than a playlist) and found it does not play the song I chose, and just resumes the last playlist.

If I ask Siri to play a playlist or song then that works, just that the same playlist will continue in the morning.

I have tried resetting, logging in and out, resetting the router.

I don't know what to try next, so asking the community if this is a widespread problem or just something I need to wrangle with on my own.