Listen Mode not available via Mackie XT Pro


I have just added a Mackie MCU Extender (XT Pro) to my existing MCU Pro control surface. Setup went fine but I have found an anomaly:
Per the Steinberg documentation for the MCU Pro / XT Pro pressing Shift+Project changes the behaviour of the solo buttons to toggle Listen Mode for each channel. However, this only works on the MCU Pro main unit; the solo buttons on the extender continue to toggle the Solo state.
I have checked the consistency of other functions between the two units and have not found any other anomalies.

Has anyone else detected this issue?


Can anyone verify this behaviour? I’d like to be sure before posting this as an issue.