Voice.Say or Audio.playSound in Jython rule on openHAB 3 no longer cancels Sonos alert (green LED)

Where the Voice and Audio actions worked flawlessly with my Sonos Symfinisk bookshelf speaker on openHAB 2.5, I can’t get them to work the same way on openHAB 3.

I can send a Voice.Say() command or an Audio.playSound() command on openHAB 3 from within a Jython rule, but after playing the Say or playSound command the Sonos speaker no longer resumes playing. The indicator LED stays green to notify that an alert was sent.

Here’s a transcript of var/log/openhab/events.log:

2021-06-16 21:09:56.263 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_Volume' changed from 17 to 50
2021-06-16 21:09:56.533 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaControl' changed from PLAY to PAUSE
2021-06-16 21:09:57.275 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_TuneInStationId' changed from 18556 to 
2021-06-16 21:09:57.283 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaTitle' changed from VRT Klara to b24a1b45-d149-44cf-8a26-66ed2171fa1d.wav
2021-06-16 21:09:57.287 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentTrack' changed from VRT Klara to  -  - b24a1b45-d149-44cf-8a26-66ed2171fa1d.wav
2021-06-16 21:09:57.303 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentAlbumCoverArt' changed from raw type (image/png): 6573 bytes to UNDEF
2021-06-16 21:09:57.648 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_Volume' changed from 50 to 25
2021-06-16 21:09:58.008 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaControl' changed from PAUSE to PLAY

and after playing the Voice.Say() command:

2021-06-16 21:10:15.457 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaTitle' changed from b24a1b45-d149-44cf-8a26-66ed2171fa1d.wav to stream.mp3?DeviceId=uuid:RINCON_xxxx&MediaSourceId=275c4aecadabd1fa12479f9d4ca64bd1&Static=true
2021-06-16 21:10:15.459 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentTrack' changed from  -  - b24a1b45-d149-44cf-8a26-66ed2171fa1d.wav to  -  - stream.mp3?DeviceId=uuid:RINCON_xxxx&MediaSourceId=275c4aecadabd1fa12479f9d4ca64bd1&Static=true
2021-06-16 21:10:15.461 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaControl' changed from PLAY to PAUSE
2021-06-16 21:10:16.025 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_TuneInStationId' changed from  to 18556
2021-06-16 21:10:16.032 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaTitle' changed from stream.mp3?DeviceId=uuid:RINCON_xxxx&MediaSourceId=275c4aecadabd1fa12479f9d4ca64bd1&Static=true to VRT Klara
2021-06-16 21:10:16.036 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentTrack' changed from  -  - stream.mp3?DeviceId=uuid:RINCON_xxxx&MediaSourceId=275c4aecadabd1fa12479f9d4ca64bd1&Static=true to VRT Klara
2021-06-16 21:10:16.617 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentAlbumCoverArt' changed from UNDEF to raw type (image/png): 6573 bytes
2021-06-16 21:10:18.845 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaControl' changed from PAUSE to UNDEF
2021-06-16 21:10:20.703 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentTrack' changed from VRT Klara to VRT Klara - ZPSTR_CONNECTING
2021-06-16 21:10:21.328 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_CurrentTrack' changed from VRT Klara - ZPSTR_CONNECTING to VRT Klara
2021-06-16 21:10:21.331 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_MediaControl' changed from UNDEF to PLAY
2021-06-16 21:10:21.415 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SYMFONISKBookshelfKitchen_Volume' changed from 25 to 0

I see that the audio volume first goes from 17% to 50%, then it goes to 25% (defined in the Voice.Say() command) and after having played the Say command it goes from 25% to 0 instead of going back to the original volume (17%).

Can anyone tell me what is happening?