Nuendo 11 Send to Izotope RX split stereo

Hello, I am still using Nuendo 7 for most of my commercial work. Testing Nuendo 11. When I try to send one side of imported stereo file with split channels (each channel on different track) in RX 8, it appears as stereo file. Bouncing selection, changing name don’t help. In Nuendo 7 it works as expected. Maybe it is known issue, what am I doing wrong? I want to send from Nuendo mono and recieve in RX mono as well.