QSplitter in QTabWidget uses wrong background-color on windows

Insert a QSplitter directly in a QTabWidget. On mac this looks ok, but on windows the QTabWidget has a slightly lighter background then the window's background. However the QSplitter's handle uses the window background, this looks really ugly. I'm assuming the expected behaviour is that the QSplitter's handle uses the background of it's parent widget instead of the windows background by default ? Currently we work around this in our applications by setting the background-color to rgba(0,0,0,0).