For example, if the project has this component (also attached as file), the type of the alias property in it is not properly resolved:

import QtQuick
Rectangle {    
    property alias redRect: redRect

    width: 200
    height: 200

    Rectangle {
        id: redRect
        width: 100
        height: 100
        color: "#ff0000"
    }
} 

The redRect property in the above component gets null propertyTypeId in database, so is impossible to determine what the property type is at runtime.