Svelte 5: `$bindable()` type is unknown about svelte HOT 3 OPEN

<script>
  // let children: unknown
  let { children } = $props();
</script>

<!-- 'children' is of type 'unknown'.js(18046) -->
{@render children()}

<script lang="ts">
  type Props = { b: boolean };
  let { b = $bindable<boolean>() }: Props = $props();
</script>

<script lang="ts">
  let {
    // Only this prop needs typing,
    // but the whole Props should be typed.
    showModal = $bindable<boolean>(),
    closeWithBackdropClick = false,
    onclose = (() => {}) as () => unknown
  } = $props();
</script>

<!-- src/lib/Component.svelte -->
<script lang="ts">
  // Even-though the fallback value has been provided,
  let { b = $bindable(false) }: Props = $props();

  // Since it is not a optional key in the Props type:
  type Props = { b: boolean };
</script>

<!-- src/routes/+page.svelte -->
<script>
  import Component from '$lib/Component.svelte';
</script>

<!-- Property 'b' is missing in type '{}' but required in type 'Props'. -->
<Component></Component>