Yes they are listed. I'm not using Mezzmo android app, but the native DLNA option of my TV, which is a Toshiba 55U2963DG.
My only workaround so far is: after watching an episode, i'll go to Mezzmo library and delete it. Then the next one will be the one that gets subtitles. It's weird, but per playlist there can only be one external subtitle shown to the TV.
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