Made Default audio input on new audio channel (Session Setup I/0 Setup) doesn't work?

I want inputs 3/4 the be default every time i create an audio channel.

ive created and selected that stereo in the Session Setup (Audio I/O Setup) and clicked Made Default. Still every time i make a new audio track the regular 1/2 inputs are loaded. So i have to change it manually every time.

Any tip or idea of why this happens? Bug?