In case anyone has been annoyed by this before:
wireshark so far always showed _only_ the BSSGP decode in the Information column of a Gb interface pcap file, even if that BSSGP was contained in the "erroneous message" IE of a NS-STATUS message.
This made it particularly difficult to spot NS-STATUS, and without custom coloring rules or search filters, a protocol trace would just look fine - except that in reality it isn't.
I've now found out what's the proper method to resolve this and submitted a patch to wireshark, which was merged very quickly: https://gitlab.com/wireshark/wireshark/-/merge_requests/2081
After this change, the Information column in the packet list will show NS-STATUS with the human-redaable cause value for the reject, rather than displaying BSSGP as if nothing odd happened.
Regards, Harald