WebEngine doesn't use 'modified' QApplication::arguments()

If I provide modified arguments to QApplication they are NOT used by WebEngine/Chrome/Blink

e.g.:

QApplication a(argc, my_argv);
qDebug() << "my_argv: " << qApp->arguments();
// ("C:\\temp\\app.exe", "--ppapi-flash-path=./pepflashplayer.dll") but no flash

so my_argv should be passed down to WebEngine but not honored

starting app manually from console works as expected:

app.exe --ppapi-flash-path=./pepflashplayer.dll

Starting app from IDE with properly set Working Directory and Arguments (--ppapi-flash-path=./pepflashplayer.dll) works too

Is Chromium still relying on arguments retrieved by GetCommandLine() ... in that case I'm not sure if this is a BUG or feature request to fix QWebEngine to conform to Qt design specs and use QApplication provided arguments actually.