diff --git a/wp-includes/block-supports/block-style-variations.php b/wp-includes/block-supports/block-style-variations.php
index a44ecdd396..8e84292ac0 100644
--- a/wp-includes/block-supports/block-style-variations.php
+++ b/wp-includes/block-supports/block-style-variations.php
@@ -249,7 +249,7 @@ function wp_resolve_block_style_variations( $variations ) {
 		 * Block style variations read in via standalone theme.json partials
 		 * need to have their name set to the kebab case version of their title.
 		 */
-		$variation_name = $have_named_variations ? $key : _wp_to_kebab_case( $variation['title'] );
+		$variation_name = $have_named_variations ? $key : ( $variation['slug'] ?? _wp_to_kebab_case( $variation['title'] ) );
 
 		foreach ( $supported_blocks as $block_type ) {
 			// Add block style variation data under current block type.
@@ -441,7 +441,7 @@ function wp_register_block_style_variations_from_theme_json_data( $variations )
 		 * Block style variations read in via standalone theme.json partials
 		 * need to have their name set to the kebab case version of their title.
 		 */
-		$variation_name  = $have_named_variations ? $key : _wp_to_kebab_case( $variation['title'] );
+		$variation_name  = $have_named_variations ? $key : ( $variation['slug'] ?? _wp_to_kebab_case( $variation['title'] ) );
 		$variation_label = $variation['title'] ?? $variation_name;
 
 		foreach ( $supported_blocks as $block_type ) {
diff --git a/wp-includes/class-wp-theme-json.php b/wp-includes/class-wp-theme-json.php
index 957434de7f..05f5e7b9e7 100644
--- a/wp-includes/class-wp-theme-json.php
+++ b/wp-includes/class-wp-theme-json.php
@@ -358,6 +358,7 @@ class WP_Theme_JSON {
 		'description',
 		'patterns',
 		'settings',
+		'slug',
 		'styles',
 		'templateParts',
 		'title',
@@ -3244,7 +3245,7 @@ class WP_Theme_JSON {
 	 * @since 6.3.2 Preserves global styles block variations when securing styles.
 	 * @since 6.6.0 Updated to allow variation element styles and $origin parameter.
 	 *
-	 * @param array $theme_json Structure to sanitize.
+	 * @param array  $theme_json Structure to sanitize.
 	 * @param string $origin    Optional. What source of data this object represents.
 	 *                          One of 'blocks', 'default', 'theme', or 'custom'. Default 'theme'.
 	 * @return array Sanitized structure.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 97ec6777a0..3541f7230b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-beta2-58412';
+$wp_version = '6.6-beta2-58413';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.