Behavior of org.freedesktop.FileManager1.ShowItemProperties is inconsistent with Thunar's own behavior

In Thunar, if I select multiple files, right-click, and then select "Properties", Thunar opens a single properties dialog that shows a "combined view" of the properties of all the selected files.

However, if I call the org.freedesktop.FileManager1.ShowItemProperties d-bus interface, passing it multiple file URIs, Thunar opens up multiple properties dialogs, one for each file.

I would expect the d-bus interface to also open a single "combined-view" dialog, no?

For reference, this is related to xfdesktop#112 (closed)