Falcon2 40W Air Assist

Hi there,
I’m a very falcon2 40w novus user and have a very
simple question.

[environment]
Firm: ver3_0_5
Tool: Lightburn ver1.7.08

[q]
My falcon2 can’t stop air assist even I turn off the
Air Assist Switch on Lightburn. And I checked the
generated GCODE.
AirOFF had M9 command
AIrON had M8 command
They’re very right code to control Air Assist.
So I suspect the problem is in the Firm or so.
Does everyone have the same problem?
If you have a solution to fix it, help me, pls.
Any advice is very welcom.

thanks in advance.