Anybody have experience of core blocks overlapping I/O blocks after SEPKS do_place? It just looks impossible to me as I've already imported all core cells and I/O pads .lef files beforehand. Logically if the die size wasn't specified it would automatically enlarge in order to fit the core in. Core and I/O pads overlapping may prompt PKS can't even recognize the I/O class. Please help. Thanks in advance!