Generate Sharepoint LINQ classes with SPMetal and ContentType

Question

I have a list MyList based on ContentType MyContentType in Sharepoint.

Now I try to generate the LINQ classes with SPMetal but the class for ContentType is created twice basically.

XML config for SPMetal

<?xml version="1.0" encoding="utf-8"?>
<Web AccessModifier="Internal" xmlns="http://schemas.microsoft.com/SharePoint/2009/spmetal">
   <List Name="MyList">
       <ContentType Name="MyContentType"></ContentType>
   </List>
  <ExcludeOtherLists/>
  <ExcludeOtherContentTypes/>
</Web>

Parts of output cs file

[Microsoft.SharePoint.Linq.ListAttribute(Name="MyList")]
public Microsoft.SharePoint.Linq.EntityList<MyContentTypeMyContentType> MyList {
    get {
        return this.GetList<MyContentTypeMyContentType>("MyList");
    }
}

[...]

[Microsoft.SharePoint.Linq.ContentTypeAttribute(Name="MyContentType", Id="0x01003D132021D84A48E9A16011B7648CBD98")]
[Microsoft.SharePoint.Linq.DerivedEntityClassAttribute(Type=typeof(MyContentTypeMyContentType))]
internal partial class MyContentType : Element {
    [...]
}

[...]

[Microsoft.SharePoint.Linq.ContentTypeAttribute(Name="MyContentType", Id="0x01003D132021D84A48E9A16011B7648CBD98", List="MyList")]
internal partial class MyContentTypeMyContentType : MyContentType {
    public MyContentTypeMyContentType() {
        this.OnCreated();
    }
}

As you can see it generates a MyContentTypeMyContentType class derived from MyContentType. But why? Its useless. How can I avoid this behaviour?

It would be correct if MyList would just be an EntityList of MyContentType instead of MyContentTypeMyContentType.

---

PS

If I add a class name in the XML config for the ContentType like this:

<ContentType Name="MyContentType" class="MyContentType"></ContentType>

It still generates a second class and names it MyContentType0 which is wrong as well.