Are you running the long-term (6.x) branch? RouterOS 7.x (stable) is much better at IPv6 as far as I know.
I'm using 7.19.2 at the moment, still has this bug (or again, could be a misconfiguration from my side, but it looks veeery odd)
I'm using 7.19.2 at the moment, still has this bug (or again, could be a misconfiguration from my side, but it looks veeery odd)