[REG 3.3.1 -> 3.5] qtcdebugger.exe displays command line window when GUI is expected

Run

<Path to Qt Creator>\qtcdebugger.exe -help

from Windows' "Run" dialog. qtcdebugger will not only show the expected GUI but also an empty command line window:

The command line window will also be shown with qtcdebugger's dialog about a crashed application.

I don't see a reason for this command line window. With Creator 3.3.1, based on Qt 5.4.1, it was not there.