Register block in PHP and Add default opt in text when saving example block in `@woocommerce/extend-cart-checkout-block` (#48581)

packages/js/extend-cart-checkout-block/$slug.php.mustache

@@ -20,6 +20,7 @@
  */
 add_action( 'woocommerce_blocks_loaded',
 	function () {
+		register_block_type_from_metadata( __DIR__ . '/build/js/checkout-newsletter-subscription-block' );
 		require_once __DIR__ . '/{{slug}}-blocks-integration.php';
 		add_action(
 			'woocommerce_blocks_cart_block_registration',

packages/js/extend-cart-checkout-block/changelog/fix-missing-default-text-eccb

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Ensures the default text shows when saving the example newsletter subscription block.

packages/js/extend-cart-checkout-block/src/js/checkout-newsletter-subscription-block/edit.js.mustache

@@ -43,7 +43,7 @@ export const Save = ( { attributes } ) => {
 	const { text } = attributes;
 	return (
 		<div { ...useBlockProps.save() }>
-			<RichText.Content value={ text } />
+			<RichText.Content value={ text || optInDefaultText } />
 		</div>
 	);
-};
+};