I don't know if you see a lot of these, sound like you may not. When you see this, look closely for ridge and/or decking sag or other evidence of roof problems, at least around here they usually rotate the existing rafters upwards and place an exterior wall below, but don't provided sufficient (if any) additional support to the radically modified room structure, for example the joists may now be undersized for the lower pitch, collar ties may have been removed, etc.