PX4Flow in PX4 SITL Not Working

I am trying to work with px4flow in SITL simulation. However, no optical flow data can be read from the sensor. Neither Mavros or Mavlink have any positioning signal about the px4flow sensor. Is there a problem with the px4flow sensor in the PX4 SITL?

It didn’t work for me either: https://github.com/PX4/Firmware/issues/14300