Route guards - beforeRouteLeave not working inside a component

[LorenRd]

Using nuxt and composition-api plugin.

The execution is not going inside, beforeRouteLeave is never called even if is a console.log it doesn't work.
The behaviour is the same if is not async.

[BradenM]

I am also witnessing this behavior while using the composition-api without nuxt.

I also attempted this, which also fails:

...
setup(props, { root }) {
  ....
  root.$options.beforeRouteLeave = (to, from, next) => { // also fails }
  ...
}

}

[posva]

beforeRoute* guards must go on view components that are associated with a route. You cannot add it to root

Closing as no reproduction has been provided and the problem likely comes from what I said above