RB260GS / SwOS ipv6 acl

Hi, I’m in need to configure ipv6 ACL on a rb260gs in order to change 802.1p priority on some packets.

When I match packet using ethertype 86DD (ipv6) the priority is successfully set, but as soon as I try to use a more specific matching (in my case protocol 17 (udp) and 58 (icmp6) packet are not matched anymore. Same issue if I try to match on destination port.

Are ipv6 acl supported by swos or is it a chip limitation ?