BLHeli32 Holybro Pixhawk 6C passtrough

Hi folk
I have replaced blheli s with TEKKO blheli32 on my Hexa. Since I am using Li-ion battery I want to change some parameters in Tekkon and also reverse the motor direction of some of the motors. After several attempts I was able to connect to Blhelisuite. I managed to change the parameters and also the direction of the motors. Everything seems to work and the motors rotate and I can arm the machine.
Why works the connection a bit random?
The FC is Pixhawk 6C, Arducopter 4.4.3, Blhelisuite 32.9.0.6.

Regards //YB