Maybe it should be:
<div style="display:none; visibility:hidden;">
<script type="application/javascript">
/* <![CDATA[ */
window.pysWooProductData = window.pysWooProductData || [];
window.pysWooProductData[ <?php echo $product_id; ?> ] = <?php echo $params; ?>;
/* ]]> */
</script>
</div>
+1. Same issue here (until 1.5.0) I think it cause of update to WP 5.7.