In some publications it is mentioned that a link local next-hop can’t be used when redistributing routes into BGP because routers receiving the route will not know what to do with the next-hop. That is one of the reason why
IPv6 operation and best practices – documents to read
Unfortunately I don’t get to do much v6 at my job yet but I still like to stay updated on what is happening. Do you run any v6 in your network? If so, do you run it native or tunneled