PCF Translator ignores some duplicate components, but not supports.

I'm importing PCF files generated from Plant 3D. Some of the PCF files include segments of connected lines, and I can't figure out how to exclude them when creating the PCF file.

When I do a merged import using the PCF Translator, some duplicate components are ignored, but duplicate supports are imported.

What duplicate components will be ignored, and is there a workaround for my case?