Is my upstream ISP sending me bad Router Advertisement?

[CGGXANNX]

According to MikroTik, the RA bug should be fixed soon:

V7.21 [stable] is released!

@nogaff So I heard back from Mikrotik and provide the following communications that came in last night my time. First response: Unfortunately, in your case it seems that in the past you used a bug in your advantage. Your ISP with "RA" advertises only option called "managed-configuration". This option tells end devices - "you will need to use DHCP service". It is incorrect to install route for SLAAC in such scenario Second response: We did dig a bit deeper and my last reply might be a bit wro…

Once the new version is out, could you then retest with DHCPv6 Client's add-default-route=no and accept-router-advertisements=yes and accept-router-advertisements-on=WAN in IPv6 -> Settings to see if that was also the bug that you encountered?