It is a known bug by IK.
In their site it is mentioned that using VST3, behavior is wrong. No polyphony also if you set the instrument voices the right way.
Way to solve is mentioned: using same midi in and midi out channels.
I lost 10 minutes when looking for a good strings plus brass preset. Then I got back to Kontakt.
I had no success in C3.
Did anyone solve it?
Thanks…