It looks like you're new here. If you want to get involved, click one of these buttons!
I'm looking into the "Trace All Nets" feature and it is really great. I'm using your "inv.gds" example, which I instantiated inside some measure pads (See attached file "module.gds").
When I run "Tools > Trace All Nets > Flat" on the top cell "MODULE" (hierarchical), none of the nets retrieve the label names which are inside the "INVERTER" cell.
When I run "Tools > Trace All Nets > Flat" on the top cell "MODULE_FLATTENED" ("MODULE" cell flattened), the nets retrieve the label names (IN, OUT, VDD and VSS).
I would expect the labels to be retrieved in both cases in "Flat" mode, or are labels inside sub cells not taken into account?
The layer stack is the same as for your example.