Nuxt 3 + Strapi 4 + TypeScript error

Hello there!

I am fairly new to TypeScript and I wanted to create a Nuxt 3 app with Strapi 4 with TypeScript. On Strapi I have plugins "strapi-plugin-transformer" for flattening my response and "shemas-to-ts" for generating TS types. So far everything worked quite well but now I have been stuck for a while on, I bet pretty simple stuff. I have single type in Strapi called Header and I am trying to load all data on FE. I took the generated type from Strapi which looks like this:

export interface Header_Plain {
    id: number;
    createdAt: Date;  updatedAt: Date;  publishedAt?: Date;  logo: Media_Plain;
    Link: HeaderLink_Plain[];
    locale: string;
    localizations?: Header_Plain[];
}

then, in my Nuxt, I have this code:

<script setup lang="ts">
const { find } = useStrapi()

const headerData = ref<Header_Plain | null>(null)

const { data, execute } = await useAsyncData(
  'header',
  () => find<Header_Plain>('header', { populate: 'deep' })
)

function loadData() {
  execute()

  headerData.value = data.value?.data
}

onMounted(() => {
  loadData()
})
</script>

The problem I have is, that I get the data from BE but in my loadData function I am getting Vue: Type Strapi4ResponseData<Header_Plain>[] is not assignable to type error. I know that I probably should use findOne instead of find but when I use findOne the problem still occurs. Could anyone help me with this? I simply don't understand why my BE data are wrapped in this Strapi4ResponseData or how I should take them out.