Vuex not initialized

Hi,

after upgrading to Quasar 2 / Vue 3 / Vuex 4, I get

`Error: [vue-wait] Vuex not initialized.`

and wherever $wait is used in the app, I get

`[Vue warn]: Property "$wait" was accessed during render but is not defined on instance. `

The initialisation is in a Quasar boot file:

import { createVueWait } from 'vue-wait'

export default ({ app, store }) => {
const vueWait = createVueWait({
useVuex: true,
registerDirective: true
})
app.use(vueWait)
}

Is it a known issue?
Thanks in advance