diff --git a/wp-includes/post.php b/wp-includes/post.php
index 9f02fff09d..5377f4eaee 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -356,7 +356,7 @@ function create_initial_post_types() {
 			'public'                => false,
 			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
 			'has_archive'           => false,
-			'show_ui'               => wp_is_block_theme(),
+			'show_ui'               => false,
 			'show_in_menu'          => false,
 			'show_in_rest'          => true,
 			'rewrite'               => false,
@@ -416,7 +416,7 @@ function create_initial_post_types() {
 			'public'                => false,
 			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
 			'has_archive'           => false,
-			'show_ui'               => wp_is_block_theme(),
+			'show_ui'               => false,
 			'show_in_menu'          => false,
 			'show_in_rest'          => true,
 			'rewrite'               => false,
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d6c3135171..29bba841e1 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52664';
+$wp_version = '6.0-alpha-52668';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.