Server side mixin never call

Hi,
Have created mixin to inject meta, in client side it's work well but the server side don't inject in context meta and title tag.

Seem to be created function is never call.
I follow official Vuejs documentation on SSR [https://ssr.vuejs.org/guide/head.html](https://ssr.vuejs.org/guide/head.html)

You have a solution ?