interior cabin lights are different to the equipment lights.
If the interior equipment lights fail from the fuse, it'll take out the driver's side sidelights too.
Dodgy angel eye inverters do that.
After that, the wire goes in to light the instruments through the dash dimmer, which is a variable resistor so you can adjust the brightness of the window switches, the dash backlight etc.
That's why i was thinking of the dimmer failing.