diff --git a/wp-admin/customize.php b/wp-admin/customize.php
index 0dd548d43a..7d4fb9fd99 100644
--- a/wp-admin/customize.php
+++ b/wp-admin/customize.php
@@ -188,16 +188,8 @@ do_action( 'customize_controls_head' );
 			<?php
 			$compatible_wp  = is_wp_version_compatible( $wp_customize->theme()->get( 'RequiresWP' ) );
 			$compatible_php = is_php_version_compatible( $wp_customize->theme()->get( 'RequiresPHP' ) );
-			$fse_safe       = true;
-
-			// Check if the theme requires the Gutenberg plugin to work correctly.
-			$theme_tags = $wp_customize->theme()->get( 'Tags' );
-
-			if ( ! empty( $theme_tags ) && in_array( 'full-site-editing', $theme_tags, true ) && ! function_exists( 'gutenberg_is_fse_theme' ) ) {
-				$fse_safe = false;
-			}
 			?>
-			<?php if ( $compatible_wp && $compatible_php && $fse_safe ) : ?>
+			<?php if ( $compatible_wp && $compatible_php ) : ?>
 				<?php $save_text = $wp_customize->is_theme_active() ? __( 'Publish' ) : __( 'Activate &amp; Publish' ); ?>
 				<div id="customize-save-button-wrapper" class="customize-save-button-wrapper" >
 					<?php submit_button( $save_text, 'primary save', 'save', false ); ?>
diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index a7bc431c37..7d17540142 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -908,20 +908,6 @@ function validate_current_theme() {
 function validate_theme_requirements( $stylesheet ) {
 	$theme = wp_get_theme( $stylesheet );
 
-	// If the theme is a Full Site Editing theme, check for the presence of the Gutenberg plugin.
-	$theme_tags = $theme->get( 'Tags' );
-
-	if ( ! empty( $theme_tags ) && in_array( 'full-site-editing', $theme_tags, true ) && ! function_exists( 'gutenberg_is_fse_theme' ) ) {
-		return new WP_Error(
-			'theme_requires_gutenberg_plugin',
-			sprintf(
-					/* translators: %s: Theme name. */
-				_x( '<strong>Error:</strong> This theme (%s) uses Full Site Editing, which requires the Gutenberg plugin to be activated.', 'theme' ),
-				$theme->display( 'Name' )
-			)
-		);
-	}
-
 	$requirements = array(
 		'requires'     => ! empty( $theme->get( 'RequiresWP' ) ) ? $theme->get( 'RequiresWP' ) : '',
 		'requires_php' => ! empty( $theme->get( 'RequiresPHP' ) ) ? $theme->get( 'RequiresPHP' ) : '',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 74b04f3d94..f3aa4fe38e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52043';
+$wp_version = '5.9-alpha-52044';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.