Singleton error in lower plugin version

I added singleton qml type into higher plugin version and lower version stopped working.

I would like to use version 0.9, but I cannot, because it cannot find MySettings component, which is defined only for version 1.0. - but I dont want to use this new component, all I want is old component of version 0.9.

Here is a quick example:

main.qml
./imports/MyPlugin/MyComponent_0_9.qml
./imports/MyPlugin/MyComponent_1_0.qml
./imports/MyPlugin/MySettings_1_0.qml
./imports/MyPlugin/qmldir

//file: main.qml
import QtQuick 2.12
import MyPlugin 0.9

//this works fine
//import MyPlugin 1.0

Item {    
    width: 100    
    height: 100    
    MyComponent {        
        anchors.centerIn: parent    
    }
}

//file: qmldir
module MyPlugin
MyComponent 0.9 MyComponent_0_9.qml
MyComponent 1.0 MyComponent_1_0.qml
singleton MySettings 1.0 MySettings_1_0.qml

//file MySettings_1_0.qml
pragma Singleton
import QtQuick 2.0

Item {    
    property int baseWidth: 50
}

MyComponent are just simple rectangles.

When I run it by:

qmlscene main.qml -I ./imports

I see error:  

main.qml:-1 MySettings is not a type

Looks like problem is that components of different major versions are declared in the same qmldir file.

singletonpluginbug.zip