lower case QML components are accepted when used with 'as' import

The qtbug-20768.tgz shows the app working fine with qmlviewer main.qml. Certainly does not seem to be correct, going by the component naming convention.
Changing the name of the file to Mypage.qml produces an error (Type Qml/Mypage unavailable)

// main.qml
import "liuli" as Qml
...

Qml.mypage {
    ...
} // Lower case "mypage", where the file is "liuli/mypage.qml"

As expected, mypage

do not work with the lower case filename (Cannot assign to non-existent property "mypage"; Mypage is not a type).

untitled38.zip shows that creator correctly recognises the type naming error.
Reproduction steps:

1. Create a Qt Quick application.
2. Add a new directory and a new qml file named mypage.qml. See untitled38.zip in the attachment.
3. Go to main.qml.
4. Move the mouse over "Qml.mypage", the tip shows "unknow type" and a red wave under it, which indicate the "Qml.mypage" is not recognized. See page.png.
5. Run the application, it works normally. The Qml.mypage can be recognized. So "Qml.mypage" should not be recognized as an "unknown type". See run.png.