[MT-AU Public] BGP Route Refresh - Invalid Subtype

Hello all, I'm seeing a possible bug (?) on my CCR2004-1G-12S+2XS running 7.19.4, where the router receives a route refresh from an IX route server with subtype 0 (which is a normal refresh in RFC 7313), the Tik warns that it is an invalid subtype. Is anyone else seeing similar? Regards, Christopher H.