diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
index 886b97e14c..c5d4e89e5e 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
@@ -312,6 +312,15 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Revisions_Contr
 		$theme_json = null;
 
 		if ( ! empty( $global_styles_config['styles'] ) || ! empty( $global_styles_config['settings'] ) ) {
+			/*
+			 * Register block style variations from the theme data.
+			 * This is required so the variations pass sanitization of theme.json data.
+			 */
+			if ( ! empty( $global_styles_config['styles']['blocks'] ) ) {
+				$variations = WP_Theme_JSON_Resolver::get_style_variations( 'block' );
+				wp_register_block_style_variations_from_theme_json_partials( $variations );
+			}
+
 			$theme_json           = new WP_Theme_JSON( $global_styles_config, 'custom' );
 			$global_styles_config = $theme_json->get_raw_data();
 			if ( rest_is_field_included( 'settings', $fields ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 282f058298..7e669e1f9f 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-alpha-61300';
+$wp_version = '7.0-alpha-61301';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.