When you configure IPv6 for the first time having little knowledge about, no IPv6 address will resolve with the depicted configuration. Found in this ancient 
documentation is that 'no_radr' is the default. From a user's POV it is hard to understand from ifconfig manpage that this has to be set to "-no_radr" to have the default router added to the list.
Please update documentation to contain "inet6 -no_radr accept_rtadv". Mark the subsequent paragraph as for envs w/o local routers, but with static config.