QT Creator 'Hide Generated Files' hides files that are manually written

When I add an cmake project that is not in the tree of the current project eg with cmake add_subdirectory (absolute_path ...):

Then for that added project the resource files (*.qrc) that are part of this project, plus their content (eg qml files) are not shown in the project view, when I have 'Hide Generated files' on. (the qrc files are added in CMake eg with add_library, noting special about it)

Also CMakeLists.txt itself for that included project itself is not shown when I have 'Hide Generated files' on. 

No problems for projects that are added with add_subdirectory with a relative path.

Problem first seen at QT creator 17.0.0, not earlier versions.