Testcase is in the attached .zip archive.
Problem: LVS can implicitly connect nets which are labelled with the same text. But it cannot connect global and routed nets through the same mechanism. For example, when connecting the PMOS bulk to VDD, it cannot be implicitly connected to VDD nets.
I.e. this does not work:
connect_global(bulk, "VSS")
connect_global(nwell, "VDD")
connect_implicit("*", "VSS")
connect_implicit("*", "VDD")
connect_global_with_implicit.zip