When chromecasting to group of devices, information about media not displayed

[itsthejoker]

Describe the bug When casting a single audio track, information about the track will be shown on the screen. If you have more than one cast-compatible device in a group through Google Home that includes a device with a screen, the device with the screen will not show relevant information about the playing media. Pictures are included below.

System (please complete the following information):

• OS: Ubuntu 18.04
• Virtualization: Docker
• Clients: Browser + ChromeCast
• Browser: Chromium Version 83.0.4103.97 (Official Build) snap (64-bit)
• Jellyfin Version: 10.5.5
• Playback: ...chromecast?
• Installed Plugins:
  • Anime: 5.0.0.0
  • AudioDB: 10.5.5.0
  • MusicBrainz: 10.5.5.0
  • Open Subtitles: 7.0.0.0
• Reverse Proxy: nginx
• Base URL: jellyfin.MYURL.com
• Networking: erm... whatever the docker container uses.
• Storage: SMB connection to NAS

To Reproduce

1. In the Google Home app, make sure that you have a group of Chromecast-enabled devices. This group should contain at least one device with a screen; either a Hub or a regular Chromecast hooked to a TV.
2. In Jellyfin, select the group as a cast target.
3. Play media.
4. See that no information is provided on the screen of the device(s) that you are casting to. Pictures at the bottom.

Expected behavior I should see information about the currently-playing media on the screen.

Logs None.

Screenshots / Photos Configuring a group in the Google Home app:

Verifying devices in the group in the Google Home app:

Screen display when casting to one device specifically (Google Home Hub):

Screen display when casting to one device specifically (Chromecast):

Screen display when casting to group of devices (Google Home Hub) -- it is playing audio when this picture was taken:

Screen display when casting to a group of devices (Chromecast):

Additional context

[neopc10]

This works on the unstable build available on 10.6 or will by the time you read this.