Can't set meta priority for some packets in netdev family!

Hi!

The following rule mangles SSH packets but not ICMPv6 one.

table netdev filter {
        chain egress {
                type filter hook egress device "br-lan" priority filter; policy accept;
                vlan id 10 ip6 daddr fdc0:7ceb:81a6::/48 meta priority set 0:6 counter packets 473 bytes 70912
        }
}

Why?

I also tried to modify ICMPv6 packets explicitly in a netdev family table without success. However, it works in an inet family table at the postrouting hook. I'm completely lost!!

--
Best regards,
Kevin Vigouroux