Getter does not work in Setup Store

[yxyx-github]

Reproduction

https://github.com/yxyx-github/pinia-getter-issue

Steps to reproduce the bug

Create a store with Pinia and define a getter which returns any value. Use the Setup Store.

In the reproduction repository the store is located at src/stores/demo-store.ts. You can comment in/out the two versions: Option Store and Setup Store.
I try to access the getter in the App.vue.

Expected behavior

Regardless of whether I use the Option Store or the Setup Store, I should have access to my getter in any Vue-Component.

Actual behavior

When I use the Option Store, my getter works fine. On the other hand, when I use the Setup Store, my getter returns undefined. I do not get any other error messages.
I can't find an example of a getter declaration within a setup store in the documentation to verify that I have declared my getter correctly.

Additional information

No response

[posva]

You have to return the value:

export const useStore = defineStore('default', () => {
    const sampleArg = ref('hello world')

    const demoGetter = computed(() => sampleArg)
+	return { sampleArg, demoGetter }
})

[yxyx-github]

Thank you so much! I am so stupid...
I use <script setup> in Vue too often where I don't need to return anything.