$ni(mi(package), bicon)$ (Player app icon) shows the album art

I'm trying to make a music player widget. When I want to select a bitmap with the icon of the music player, this show the album art and not the icon.

OS: 7.1.1
Phone: OnePlus 3T

Actually it shows an icon from the notifications. If no music player is open (really closed) then it still shows my first notification image.