Is it possible to remove the dangling power/ground net in Openlane? For example, the power/ground nets on M4 in between two macros are placed close together vertically; however, these nets are not connected to the power/ground nets on M5 because they are too short. These nets cause LVS errors because these nets are extracted as vssa1_uq0 which does not exist in the netlist.

if this is a pdngen issue you can file a report with openroad with an example.