Manually typing slot data in template does not work in Volar TS Server prerelease

[loilo]

Manually typing slot data of untyped components works with stable TypeScript Vue Plugin (1.2.0) but breaks in the current prerelease (1.3.17):

Component code:

<script lang="ts" setup>
import { defineComponent } from 'vue'

let UntypedComponent = defineComponent({})
</script>

<template>
  <UntypedComponent>
    <template #default="data: { foo: string }">
      {{ data.foo }}
    </template>
  </UntypedComponent>
</template>

Is there anything else I can provide to help with resolving this? :)

[jacob-carlborg-apoex]

It's broken in the latest version (1.3.18) as well.