diff --git a/wp-includes/block-supports/shadow.php b/wp-includes/block-supports/shadow.php
index 0ccaf3fd44..fffc72e6b8 100644
--- a/wp-includes/block-supports/shadow.php
+++ b/wp-includes/block-supports/shadow.php
@@ -43,6 +43,7 @@ function wp_register_shadow_support( $block_type ) {
  * This will be applied to the block markup in the front-end.
  *
  * @since 6.3.0
+ * @since 6.6.0 Return early if __experimentalSkipSerialization is true.
  * @access private
  *
  * @param  WP_Block_Type $block_type       Block type.
@@ -52,7 +53,10 @@ function wp_register_shadow_support( $block_type ) {
 function wp_apply_shadow_support( $block_type, $block_attributes ) {
 	$has_shadow_support = block_has_support( $block_type, 'shadow', false );
 
-	if ( ! $has_shadow_support ) {
+	if (
+		! $has_shadow_support ||
+		wp_should_skip_block_supports_serialization( $block_type, 'shadow' )
+	) {
 		return array();
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a67fbd5f8e..f31c73bc1c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58311';
+$wp_version = '6.6-alpha-58312';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.