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error: media-controller failed to upgrade! in Svelte #1079

Description

@MarkLyck

When trying to use the template theming in Svelte I get the following error:

[mux-player 3.3.0] <media-controller> failed to upgrade!

I created a minimal reproducible example in svelte-kit, by making a single +page.svelte file with the following code:

<script lang="ts">
  import '@mux/mux-player';
  import 'media-chrome';
</script>

<div>
  <template id="tiny-theme">
    <media-controller>
      <slot name="media" slot="media"></slot>
      <media-control-bar>
        <media-play-button></media-play-button>
      </media-control-bar>
    </media-controller>
  </template>

  <mux-player
    theme="tiny-theme"
    stream-type="on-demand"
    playback-id="A3VXy02VoUinw01pwyomEO3bHnG4P32xzV7u1j1FSzjNg"
  ></mux-player>
</div>

If I remove the theme="tiny" the video loads fine with the default theme, and the error is now shown. However if I try to apply this simple theme copied from the docs, the video never loads, and the error above is thrown.

I have tried disabling SSR, or only rendering it in the browser after onMount, but that doesn't make a difference.

minimal reproduction: https://stackblitz.com/edit/bolt-sveltekit-rpzv8qq5?file=src%2Froutes%2F%2Bpage.svelte

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