Any objects and grenades are falling through the hotel floor. I tested another building and it isn't happening, so I think it's something to do with the destruction you added. Bullets and M203s work properly. This problem effects both hotels I tested.
I also seem to be having some trouble with the destruction. It looks like destruction has been implemented only for the hotel shown in the video. So I went to it, and it seems like only one section on the corner works with destruction, as well as the bar sign. Everything else just falls and collapses like vanilla. The one section that did work went from undamaged straight to most of the windows blown out and some floors collapsed. After the first destruction effect happened, I was sometimes able to blow out a few more windows that were still undamaged but was unable to do any more damage.
I launched and downloaded through play with six, running no other mods. When I launch, I receive the error "Addon 'CHN_Urban' requires addon 'CAData'" Testing happened through the editor with Zeus. After I ran into the problem I diagnosed the file, it was fine, and I ran it through steam and playwithsix to confirm.