Send page not working with Mackie MCU protocol

When I send a note 41 message to assign the encoders to the send page the encoders doesn’t work on the selected track.

  1. Connect a MCU interface to Cubasis 3.7.5 on iPad. In this case a M-Audio Oxygen Pro 49.
  2. Send a note bang on note 41 to assign the encoders to send.
  3. Select a track with active sends.
  4. Turn the encoders

Expected result is that the volume of the send would change. Actual result is that nothing happens.

Sending a note bang for pans (note 42) and for eq (note 44) works as expected.
For eq the active encoders is limited by the track count but that I have reported as a seperate issue.