Issue Cubase 11.041 Surround plugin not recognised if group of fx channel set to 6.0music

So… I bought Inspirata Professional today and wanted to try out the multi input facilities. I created an FX track (also tried a group track) and set the type to 6.0 music. (Yes I set up the audio connections as well.)
Only 2 inputs showed up in the plugin instead of 6. I checked the insert routing and only the first 2 inputs were connected. After a long time messing about I tried a different configuration - all the inputs appeared. It even works in 6.0 cine. Why do I always pick the buggy option?