This seems like a really bad thing to do. If any of those reserved bits get used for a legitimate purpose in the future then none of these networks will be accessible. Reserved should mean "set to 0 when you send, ignore on when you receive". It's not like these bits actually cost any additional processing. There's literally no benefit to dropping these packets, and it's shenanigans like this that mean we can't improve protocols easily in the future.

I wonder how many routers are filtering IPv4 packets with fragment offsets of 8190 and 8191?