diff --git a/lib/class-wp-theme-json-resolver.php b/lib/class-wp-theme-json-resolver.php
index 1d5d9cc1380b2e..e1a22cf3ea489d 100644
--- a/lib/class-wp-theme-json-resolver.php
+++ b/lib/class-wp-theme-json-resolver.php
@@ -519,9 +519,15 @@ public static function get_user_data() {
 	/**
 	 * Returns the data merged from multiple origins.
 	 *
-	 * There are three sources of data (origins) for a site:
-	 * default, theme, and custom. The custom's has higher priority
-	 * than the theme's, and the theme's higher than default's.
+	 * There are four sources of data (origins) for a site:
+	 *
+	 * - default => WordPress
+	 * - blocks  => each one of the blocks provides data for itself
+	 * - theme   => the active theme
+	 * - custom  => data provided by the user
+	 *
+	 * The custom's has higher priority than the theme's, the theme's higher than blocks',
+	 * and block's higher than default's.
 	 *
 	 * Unlike the getters
 	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_core_data/ get_core_data},
@@ -529,7 +535,7 @@ public static function get_user_data() {
 	 * and {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_user_data/ get_user_data},
 	 * this method returns data after it has been merged with the previous origins.
 	 * This means that if the same piece of data is declared in different origins
-	 * (user, theme, and core), the last origin overrides the previous.
+	 * (default, blocks, theme, custom), the last origin overrides the previous.
 	 *
 	 * For example, if the user has set a background color
 	 * for the paragraph block, and the theme has done it as well,
@@ -540,8 +546,9 @@ public static function get_user_data() {
 	 *              added the `$origin` parameter.
 	 * @since 6.1.0 Added block data and generation of spacingSizes array.
 	 *
-	 * @param string $origin Optional. To what level should we merge data.
-	 *                       Valid values are 'theme' or 'custom'. Default 'custom'.
+	 * @param string $origin Optional. To what level should we merge data:'default', 'blocks', 'theme' or 'custom'.
+	 *                       'custom' is used as default value as well as fallback value if the origin is unknown.
+	 *
 	 * @return WP_Theme_JSON
 	 */
 	public static function get_merged_data( $origin = 'custom' ) {
@@ -550,16 +557,24 @@ public static function get_merged_data( $origin = 'custom' ) {
 		}
 
 		$result = static::get_core_data();
+		if ( 'default' === $origin ) {
+			$result->set_spacing_sizes();
+			return $result;
+		}
+
 		$result->merge( static::get_block_data() );
-		$result->merge( static::get_theme_data() );
+		if ( 'blocks' === $origin ) {
+			return $result;
+		}
 
-		if ( 'custom' === $origin ) {
-			$result->merge( static::get_user_data() );
+		$result->merge( static::get_theme_data() );
+		if ( 'theme' === $origin ) {
+			$result->set_spacing_sizes();
+			return $result;
 		}
 
-		// Generate the default spacingSizes array based on the merged spacingScale settings.
+		$result->merge( static::get_user_data() );
 		$result->set_spacing_sizes();
-
 		return $result;
 	}
 
diff --git a/lib/compat/wordpress-6.2/class-wp-theme-json-resolver-6-2.php b/lib/compat/wordpress-6.2/class-wp-theme-json-resolver-6-2.php
index 22707be2f994f4..a66983dfad9b0c 100644
--- a/lib/compat/wordpress-6.2/class-wp-theme-json-resolver-6-2.php
+++ b/lib/compat/wordpress-6.2/class-wp-theme-json-resolver-6-2.php
@@ -17,63 +17,6 @@
  */
 class WP_Theme_JSON_Resolver_6_2 extends WP_Theme_JSON_Resolver_Base {
 
-	/**
-	 * Returns the data merged from multiple origins.
-	 *
-	 * There are four sources of data (origins) for a site:
-	 *
-	 * - default => WordPress
-	 * - blocks  => each one of the blocks provides data for itself
-	 * - theme   => the active theme
-	 * - custom  => data provided by the user
-	 *
-	 * The custom's has higher priority than the theme's, the theme's higher than blocks',
-	 * and block's higher than default's.
-	 *
-	 * Unlike the getters
-	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_core_data/ get_core_data},
-	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_theme_data/ get_theme_data},
-	 * and {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_user_data/ get_user_data},
-	 * this method returns data after it has been merged with the previous origins.
-	 * This means that if the same piece of data is declared in different origins
-	 * (default, blocks, theme, custom), the last origin overrides the previous.
-	 *
-	 * For example, if the user has set a background color
-	 * for the paragraph block, and the theme has done it as well,
-	 * the user preference wins.
-	 *
-	 * @param string $origin Optional. To what level should we merge data:'default', 'blocks', 'theme' or 'custom'.
-	 *                       'custom' is used as default value as well as fallback value if the origin is unknown.
-	 *
-	 * @return WP_Theme_JSON
-	 */
-	public static function get_merged_data( $origin = 'custom' ) {
-		if ( is_array( $origin ) ) {
-			_deprecated_argument( __FUNCTION__, '5.9.0' );
-		}
-
-		$result = static::get_core_data();
-		if ( 'default' === $origin ) {
-			$result->set_spacing_sizes();
-			return $result;
-		}
-
-		$result->merge( static::get_block_data() );
-		if ( 'blocks' === $origin ) {
-			return $result;
-		}
-
-		$result->merge( static::get_theme_data() );
-		if ( 'theme' === $origin ) {
-			$result->set_spacing_sizes();
-			return $result;
-		}
-
-		$result->merge( static::get_user_data() );
-		$result->set_spacing_sizes();
-		return $result;
-	}
-
 	/**
 	 * Returns the user's origin config.
 	 *