Starting new instance with profile and drawing

I want to start two instances of BricsCad with different profiles.
From the commandline:
bricscad.exe /p profileA
bricscad.exe /p profileB
Works great; so far so good.

Now I close all BricsCad windows and try this:
bricscad.exe /p profileA
bricscad.exe /p profileB c:\temp\mydrawing.dwg
Result: the dwg is opened in the existing instance with profile A, ignoring the "/p profileB" completely. Bug or feature? Is there any workaround for this?