The same file is shown multiple times in "project view" with cmake and visual studio generator

The Qt Creator shows  the same file multiple times in the project view. This happens even with the most simple cmake files generated by the new project wizard. The problem can be reproduced by selecting "Visual Studio 15 2017" as cmake generator.See the attached screenshots on how to set up the kit in order to reproduce the bug (Unbenannt1.png) and the resulting error (Unbenannt.png). When the nmake generator gets choosen (the default) the bug dissapears.