Now it seems more plausible that telegram-desktop suffered from the same problem. I discovered my pavucontrol acting the same way as mpv, and after some investigation I got that:

```
+radio at buer in ~ > for file in ~/.guix-home/profile/bin/*
                          file -L $file
                      end | grep empty
/home/radio/.guix-home/profile/bin/mpv: empty
/home/radio/.guix-home/profile/bin/pamixer: empty
/home/radio/.guix-home/profile/bin/pavucontrol: empty
/home/radio/.guix-home/profile/bin/pinentry: empty
/home/radio/.guix-home/profile/bin/pinentry-gtk-2: empty
/home/radio/.guix-home/profile/bin/redshift: empty
/home/radio/.guix-home/profile/bin/yt-dlp: empty

```

I hope it can be useful to understand what is happening.