Revert "Add to Cart with Options Block > Remove global variable overwrite. (#9457)"

This reverts commit fae7af0.

Author: mikejolley

src/BlockTypes/AddToCartForm.php

@@ -25,18 +25,23 @@ class AddToCartForm extends AbstractBlock {
 	 * @return string | void Rendered block output.
 	 */
 	protected function render( $attributes, $content, $block ) {
+		global $product;
+
 		$post_id = $block->context['postId'];
 
 		if ( ! isset( $post_id ) ) {
 			return '';
 		}
 
-		$product = wc_get_product( $post_id );
 		if ( ! $product instanceof \WC_Product ) {
-			return '';
+			$product = wc_get_product( $post_id );
+			if ( ! $product instanceof \WC_Product ) {
+				return '';
+			}
 		}
 
 		ob_start();
+
 		/**
 		 * Trigger the single product add to cart action for each product type.
 		*