I don't know about him, but it works fine for me . Even if I take, say, a door 80in height, and ventilator of elevation 78in,and drag them to the same place
Surprisingly, if I group the objects outside - and insert - only one of the objects will be shown
But if I insert first, then group, there's no change.

What with the improvements in this version, and db4techs lighting improvements, it looks like a very interesting time coming up :-0