Changing brightness changes monitor black levels

I use an B27T-7 and P23T-6 monitors. When I use the brightness slider in System Tray it changes Brightness on B27, but on P23 it changes Brightness and Black Levels setting. I think it might be a bad implementation of ddc/ci in that monitor, as I had simmilar issue under Windows. Is there maybe a way to change just a single monitor brightness, instead of sending commands to all of them?

Not yet, but it’s being worked on