It's for printer event LEDs not for case light sorry

Yes I am Sure ,
In Marlin 2.0 you need to Use M109 and Not M104 to activate the case light
if you use M104 the neopixel leds don't work.
if you use M109 the leds goes from green to red until the température is reach and go to white at printing start.
So we need to use M109 and not M104

For our printer we need to use M109 to control case light.
But Matter Control convert automaticly M109 to M104.
how can i remove the automatic convert ?