Can't include static lib in new qbs version (1.12)

Please help me.

I have a static lib builded with qt earlier, and it uses Qt libs. And the next app is compilable in qbs 1.11 versions and isn't in new qbs 1.12:

Application {
    qbsSearchPaths: "path_to_my_modules"
    Depends { name: "Qt.widgets"  }
    Depends { name: "mylibs.mylib" }
    files: "main.cpp"
}

On the linking step it outs multiple errors, kind of:

undefined reference to `_imp___ZN7QString6appendERKS_'
undefined reference to `_imp___Z18qSetMessagePatternRK7QString'

... etc.

the module mylib looks like:

import qbs

Module {
    Depends { name: "cpp" }
    cpp.includePaths: path
    cpp.staticLibraries: path + "/libmylib.a"
}

Is it a bug, or I need to do some corrections?

Trying to link on Windows 10 (64bit) with Qt Creator 4.6 and 4.7 rc for old and new qbs versions respectively.

The problem here is that qbs cannot know that mylib has a Qt dependency. It may have accidentally worked for you in previous versions, but that was just luck. Rewriting your module should help:

Module {
    Depends { name: "Qt.core" } // Or whatever modules mylib uses
    Group {
        filesAreTargets: true
        fileTags: "staticlibrary"
        filePath: path + "/libmylib.a"
    }
}