This is a regression after applying the Dec-22 update.
The prop rpm/pitch control knob shows increase/decrease mouse hints and the knob itself seems to turn, but the target rpm value doesn’t increase or decrease.
Repro steps:
Start a flight in the VL3. Default is 5800 rpm, the ‘takeoff’ setting
With the motor running, enter the cockpit interior view and attempt to modify the prop pitch/rpm value with the adjustment knob to the right of the fuel tank selector.