After more investigation, I found out the root of this bug: what you see in the indicator is the Media Player (the video app) which cannot play audio. On the other hand, what would be useful to display here, is the Music app (which sadly doesn't have this DBUS-MPRIS functionality.
After more investigation, I found out the root of this bug: what you see in the indicator is the Media Player (the video app) which cannot play audio. On the other hand, what would be useful to display here, is the Music app (which sadly doesn't have this DBUS-MPRIS functionality.