Unable to use $fetchState in Nuxt 2.12

So I'm trying to use the new functionality describe in the documentation.

However I'm ending up getting this error :

Property or method "$fetchState" is not defined on the instance but referenced during render.

Even though my component define clearly the fetch() method and I manage to get something out of it.

<template>
    <div v-if="$fetchState">
        <p v-if="$fetchState.pending">Fetching posts...</p>
        <p v-else-if="$fetchState.error">Error while fetching posts</p>
        <div v-else>
            <div v-if="content.content1" v-html="content.content1" />
            <div v-if="content.content2" v-html="content.content2" />
        </div>
    </div>
</template>
<script>
import { mapState } from 'vuex'

export default {
    async fetch({ store, error }) {
        try {
            await store.dispatch('home/fetchContent')
        } catch (e) {
            error({
                statusCode: 503,
                message: 'Unable to fetch'
            })
        }
    },
    computed: mapState({
        content: (state) => state.home.content
    })
}
</script>

Has anybody ever encountered that before ?