It appears the recent changes to Drivers/Adafruit_usbser/Adafruit_usbser.inf to add the new boards have the wrong PID for the UF2 WebUSB dummy drivers.
For example the Hallowing M4 shows:
"%ADAFRUIT_BOARD_804A% UF2 Bootloader (0049:00)"=DriverInstall, USB\VID_239A&PID_0049&MI_00
"%ADAFRUIT_BOARD_804A% UF2 WebUSB dummy (004A:04)"=NullInstall, USB\VID_239A&PID_004A&MI_04
Should be (as shows up in the Device Manager):
"%ADAFRUIT_BOARD_804A% UF2 WebUSB dummy (0049:04)"=NullInstall, USB\VID_239A&PID_0049&MI_04
It appears the recent changes to Drivers/Adafruit_usbser/Adafruit_usbser.inf to add the new boards have the wrong PID for the UF2 WebUSB dummy drivers.
For example the Hallowing M4 shows: "%ADAFRUIT_BOARD_804A% UF2 Bootloader (0049:00)"=DriverInstall, USB\VID_239A&PID_0049&MI_00 "%ADAFRUIT_BOARD_804A% UF2 WebUSB dummy (004A:04)"=NullInstall, USB\VID_239A&PID_004A&MI_04
Should be (as shows up in the Device Manager): "%ADAFRUIT_BOARD_804A% UF2 WebUSB dummy (0049:04)"=NullInstall, USB\VID_239A&PID_0049&MI_04