We have received feedback that the current play icon is confusing a couple of times already, so we will change it to something that more clearly indicates that a 3D scene will be loaded, not a video.
For now, if you have a more suitable icon hosted on some external server, you can replace the default icon with a following body-end.html file:
<script>
document.getElementById('play-button').src = "https://img.icons8.com/material-sharp/24/000000/3d-select.png";
</script>