Hmm no, I haven’t had this issue. Tempo works fine for me, it’s been mostly bug-free except for a few oversights:

• search doesn’t work offline
• can’t play AAC files
• can’t skip songs via my Pebble watch

I’m (still) on a Pixel 3a, running LineageOS, in case that matters.

I currently host Navidrome, which has an okay web player. On Android I use “Tempo” (though it is unmaintained) to connect to it, and on Linux I use Tauon (though it has very poor playback). I could not find a native Linux client that is not buggy unfortunately, so I’m also on the lookout for better solutions! I’m not familiar with the device you are talking about but every client I tried supports MPRIS, which are the regular media controls that can be used via the playerctl command, so you should be able to hook things up that way.