Disable sync NGS and PSO2 body not working?

So there is an option to not sync changes you do to your body to PSO2, but whenever I change to PSO2 from NGS I have my NGS body, with the same clothes, colors and stuff. And if I change it back to my PSO2 body, unchecking the sync settings, and go back to NGS, I have my PSO2 body instead. Is this just not working? I wanted to have different models for PSO2 and NGS but that option doesn't seem to do anything or I'm not understanding how it works.

It allows different proportions per body type, like human body size versus cast body size

That is one of the sync options, but there is another for PSO2 and NGS.