fix proceed to checkout button (#6804)

src/BlockTypes/ProceedToCheckoutBlock.php

@@ -11,4 +11,16 @@ class ProceedToCheckoutBlock extends AbstractInnerBlock {
 	 * @var string
 	 */
 	protected $block_name = 'proceed-to-checkout-block';
+
+
+	/**
+	 * Extra data passed through from server to client for block.
+	 *
+	 * @param array $attributes  Any attributes that currently are available from the block.
+	 *                           Note, this will be empty in the editor context when the block is
+	 *                           not in the post content on editor load.
+	 */
+	protected function enqueue_data( array $attributes = [] ) {
+		$this->asset_data_registry->register_page_id( isset( $attributes['checkoutPageId'] ) ? $attributes['checkoutPageId'] : 0 );
+	}
 }