Steam Deck game theme music in desktop mode but not in gaming mode

I've seen that the steam app has music theme for each game I install, even in emulators.

I don't really know if this is installed in automatic by emudeck, since I haven't installed any plugin from decky before and it's weird that when I added Metal Gear Solid 3 in emulator, it had the "Snake Eater" theme in the game selection window on steam.

The issue is that, it only works when I open the steam app in desktop mode, even selecting big picture mode, but when I return to gaming mode, there's no music themes, and there's no menu to fix this.

It's not an audio problem, since the menu has the steam sounds when you navigate the menu.

Does anyone knows how to fix this? is it a plugin error or something that needs update?

Do you recommend that I better download the Audio Loader plugin from decky?