13.8.9 Designer Block Component Limitations

If you instantiate the same Designer Block many times in the <top> design, only the first instance retains the place-and-route information (if it has any); the others do not. Only the netlist is preserved.

To preserve the relative placement and routing of other blocks you must move the blocks using a PDC command. This PDC file must be imported as a source file along with the netlist(s) and CDB files. If possible, routing is preserved when you move the blocks with a PDC command. See the move_block PDC command for more information.