TreeNode is not Displaying Leafs of Specializations, only if all SPecialized Types have an Instance

We use the New TreeNode DataWidget and want to display some leaf Nodes which can be of Different Specializations (INterface Type1 and Interface Type2)   The TreeNode will only display the LeafNodes if every possible Specialization Type have at least one Object attached to the parent.  We have created a sample App to demonstrate the Problem (Adding Type1 and Type2 Objects)   Only when Instances of Both Subtypes are added, the Tree Will Render the leaves Mendix - Page (
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