Auto-Select Subtitle Mode - doesn't work on live TV?

I’m running PMS under Docker on Synology, viewing on AppleTV, and tuning with an HDHomeRun.

I have Auto-Select Subtitle Mode set to “Always Enabled”. This works great for movie/tv files served by Plex, but not on streams from the tuner.

If I view Playback Settings by swiping down on the stream, I see “Unknown (Closed Captions)” under “subtitles”. It is checked by default, which is good! However no subtitles are shown.

If I switch it to “off” and back to “unknown” again, the subtitles appear.

I see the same behavior on web and AppleTV, so this seems like a server bug.

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