I played around a little today.
In Discourse version b618d08d36 it still works. The menu items are all set to vdo and disappear when the layout changes to the mobile version. In Discourse version 88d259b73a from today it does not matter if the parameter for a menu item is vdo or even vdm - it is shown always. That leads to the problem that the site icon is not visible anymore and also the elements on the right side of the header bar.
Any idea about this? I am happy to give more details, but at the moment I do not know what might be interesting or important. 