I have added two qrc files to my .pro: one with only image files and one with all the qml files.
The first one is working successfully (images), but the second one display duplicated items in my project hierarchy as you can see in the attached screen:
This is my .pro file (only related code lines):
It didn't happen in the previous version I tested 5.10.0 but from now on, as you can see the qml files are recognized both as resource and also as a source file.
I've checked some related issues and the more similar is this one: