To improve productivity, the following MEP elements stay connected and assigned to their systems when demolished: pipes, ducts, conduit, cable tray, wires, and fabrication parts.
If elements are added automatically with different phases connected on each side of the elements, those elements are assigned to the current phase of the view.
If elements are added automatically with demolished elements connected on all sides, those elements are demolished.
This feature was suggested by customers on the Ideas forum and is described on the product road map.