IPv6: Report another invalid case as invalid, not truncated

[tcpdump] / tests / quic_32_bit_pointer_overflow.out

    1  14:32:46.453540455 IP6 ::8:46:ee:102:202:202 > 202:200:0:fe7e:b65f:677a:82b:601: HBH [payload+header length 201311194 > length 58451] (invalid) 0 > 443: quic, initial, vb2a10200, dcid 00000100, length 1 [|quic]