SKR mini V3 extruder/enclosure fan cant use FAST_PWM_FAN or FAN_SOFT_PWM

[crazyfrog1]

extruder/enclosure fan cant use FAST_PWM_FAN or FAN_SOFT_PWM resulting in PWM noise with fans working like speakers.
I've been trying to use the skr mini e3 v3 to make my printer run quieter as this model has a mosfet on each fan output. I appreciate I could buy a voltage regulator and even properly 12v fans but it seems silly for anyone to have to do that.

Steps to reproduce

uncomment #define FAST_PWM_FAN
E0_AUTO_FAN_PIN PC7 for extruder
#define EXTRUDER_AUTO_FAN_SPEED 150 // 255 == full speed
CONTROLLER_FAN_PIN PB15 for enclosure
#define CONTROLLERFAN_SPEED_ACTIVE 150 // (0-255) Active speed, used when any motor is enabled

Expected behavior
Controlling the extruder fan using the part cooling fan socket and marlin menus is very quiet at about 58% speed with very little pwm noise. Running the extruder fan at similar speeds in the extruder fan socket should result in similar noise levels

Actual behavior
Loads of pwm noise like FAST_PWM_FAN is not enabled.

Additional Information

Marlin.zip