diff --git src/wp-includes/theme.php src/wp-includes/theme.php
index a36fe79..92d52ae 100644
--- src/wp-includes/theme.php
+++ src/wp-includes/theme.php
@@ -2549,7 +2549,7 @@ function _wp_customize_include() {
  * @param WP_Post $changeset_post Changeset post object.
  */
 function _wp_customize_publish_changeset( $new_status, $old_status, $changeset_post ) {
-	global $wp_customize;
+	global $wp_customize, $wpdb;
 
 	$is_publishing_changeset = (
 		'customize_changeset' === $changeset_post->post_type
@@ -2600,7 +2600,41 @@ function _wp_customize_publish_changeset( $new_status, $old_status, $changeset_p
 	 * and thus garbage collected.
 	 */
 	if ( ! wp_revisions_enabled( $changeset_post ) ) {
-		wp_trash_post( $changeset_post->ID );
+		$post = $changeset_post;
+		$post_id = $changeset_post->ID;
+
+		// The following re-formulates the logic from wp_trash_post() as done in wp_publish_post().
+		if ( ! EMPTY_TRASH_DAYS ) {
+			wp_delete_post( $post_id, true );
+		} else {
+			/** This action is documented in wp-includes/post.php */
+			do_action( 'wp_trash_post', $post_id );
+
+			add_post_meta( $post_id,'_wp_trash_meta_status', $post->post_status );
+			add_post_meta( $post_id,'_wp_trash_meta_time', time() );
+
+			$wpdb->update( $wpdb->posts, array( 'post_status' => 'trash' ), array( 'ID' => $post->ID ) );
+			clean_post_cache( $post->ID );
+
+			$old_status = $post->post_status;
+			$post->post_status = 'publish';
+			wp_transition_post_status( 'publish', $old_status, $post );
+
+			/** This action is documented in wp-includes/post.php */
+			do_action( 'edit_post', $post->ID, $post );
+
+			/** This action is documented in wp-includes/post.php */
+			do_action( "save_post_{$post->post_type}", $post->ID, $post, true );
+
+			/** This action is documented in wp-includes/post.php */
+			do_action( 'save_post', $post->ID, $post, true );
+
+			/** This action is documented in wp-includes/post.php */
+			do_action( 'wp_insert_post', $post->ID, $post, true );
+
+			/** This action is documented in wp-includes/post.php */
+			do_action( 'trashed_post', $post_id );
+		}
 	}
 }
 
diff --git tests/phpunit/tests/customize/manager.php tests/phpunit/tests/customize/manager.php
index a28d834..7c9d98b 100644
--- tests/phpunit/tests/customize/manager.php
+++ tests/phpunit/tests/customize/manager.php
@@ -416,6 +416,7 @@ class Tests_WP_Customize_Manager extends WP_UnitTestCase {
 	 * @covers WP_Customize_Manager::save_changeset_post()
 	 */
 	function test_save_changeset_post_without_theme_activation() {
+		global $wp_customize;
 		wp_set_current_user( self::$admin_user_id );
 
 		$did_action = array(
@@ -425,7 +426,7 @@ class Tests_WP_Customize_Manager extends WP_UnitTestCase {
 		);
 		$uuid = wp_generate_uuid4();
 
-		$manager = new WP_Customize_Manager( array(
+		$wp_customize = $manager = new WP_Customize_Manager( array(
 			'changeset_uuid' => $uuid,
 		) );
 		$manager->register_controls();
@@ -507,7 +508,7 @@ class Tests_WP_Customize_Manager extends WP_UnitTestCase {
 		$this->assertEquals( $previous_saved_data, json_decode( get_post( $post_id )->post_content, true ) );
 
 		// Attempt a non-transactional/incremental update.
-		$manager = new WP_Customize_Manager( array(
+		$wp_customize = $manager = new WP_Customize_Manager( array(
 			'changeset_uuid' => $uuid,
 		) );
 		$manager->register_controls(); // That is, register settings.
@@ -544,27 +545,37 @@ class Tests_WP_Customize_Manager extends WP_UnitTestCase {
 		$this->assertEquals( $customize_changeset_save_data_call_count + 1, $this->customize_changeset_save_data_call_count );
 
 		// Publish the changeset.
-		$manager = new WP_Customize_Manager( array( 'changeset_uuid' => $uuid ) );
+		$wp_customize = $manager = new WP_Customize_Manager( array( 'changeset_uuid' => $uuid ) );
 		$manager->register_controls();
-		$GLOBALS['wp_customize'] = $manager;
+		$manager->add_setting( 'scratchpad', array(
+			'type' => 'option',
+			'capability' => 'exist',
+		) );
+		$manager->get_setting( 'blogname' )->capability = 'exist';
+		wp_set_current_user( self::$subscriber_user_id );
 		$r = $manager->save_changeset_post( array(
 			'status' => 'publish',
 			'data' => array(
 				'blogname' => array(
 					'value' => 'Do it live \o/',
 				),
+				'scratchpad' => array(
+					'value' => '<script>console.info( "HELLO" )</script>',
+				),
 			),
 		) );
 		$this->assertInternalType( 'array', $r );
 		$this->assertEquals( 'Do it live \o/', get_option( 'blogname' ) );
 		$this->assertEquals( 'trash', get_post_status( $post_id ) ); // Auto-trashed.
+		$this->assertContains( '<script>', get_post( $post_id )->post_content );
+		$this->assertEquals( $manager->changeset_uuid(), get_post( $post_id )->post_name, 'Expected that the "__trashed" suffix to not be added.' );
+		wp_set_current_user( self::$admin_user_id );
 
 		// Test revisions.
 		add_post_type_support( 'customize_changeset', 'revisions' );
 		$uuid = wp_generate_uuid4();
-		$manager = new WP_Customize_Manager( array( 'changeset_uuid' => $uuid ) );
+		$wp_customize = $manager = new WP_Customize_Manager( array( 'changeset_uuid' => $uuid ) );
 		$manager->register_controls();
-		$GLOBALS['wp_customize'] = $manager;
 
 		$manager->set_post_value( 'blogname', 'Hello Surface' );
 		$manager->save_changeset_post( array( 'status' => 'auto-draft' ) );