DwC Importer - containerize errors on retry when one object already added

[mjy]

When I import a recordset, and I do *not* choose containerize
   then I see Errors for rows that have duplicate catalogNumbers
      then I update the settings to select the containerize option
         and I retry to import
            and the record Errors again

Probably not technically a bug. If we can't fix it we could disable the containerize button after any one record is imported?

[LocoDelAssembly]

Did it error for the same reason or even initial error was actually catalog number already taken? I would expected it to pass when setting containerize even if wasn't set on first try.

Please upload sample here for testing if data is not private.