Error: SMUI Textfield initialized without Input component

[vhscom]

Describe the bug

I'm using the v7 beta and this code from OP of #274 throws an error:

<script>
  import TextField from "@smui/textfield"
</script>
<TextField/>

Error thrown:

Textfield.svelte:431 Uncaught (in promise) Error: SMUI Textfield initialized without Input component.
    at Textfield.svelte:431:30

Among other probable methods, the error can be resolved by setting a bind:value for the Textfield tag like:

<script>
  import TextField from "@smui/textfield"
  let quantity = ''
</script>
<TextField/>
<Textfield
  bind:value={quantity}
  label="Quantity"
/>

Expected behavior
Component renders when <Textfield /> is added to the page, error specified is not thrown

Additional context
I'm using the v7 beta 15 but I suspect this bug has existed for a while and may be a regression if #274 was fixed in v5.