Hi,
FYI. RFC 9288, "Recommendations on the Filtering of IPv6 Packets Containing IPv6 Extension Headers at Transit Routers" (available at: RFC 9288: Recommendations on the Filtering of IPv6 Packets Containing IPv6 Extension Headers at Transit Routers)
FWIW, IMO most of the value is in the analysis of what protocols/features use what EHs, and what would break (if anything) if packets with EHs are dropped.
These other two are useful for context:
* RFC 9098, "Operational Implications of IPv6 Packets with Extension
Headers" (RFC 9098: Operational Implications of IPv6 Packets with Extension Headers)
* RFC 7872, "Observations on the Dropping of Packets with IPv6 Extension
Headers in the Real World (RFC 7872: Observations on the Dropping of Packets with IPv6 Extension Headers in the Real World).
Thanks!
Cheers,
Fernando