// Then, override styles so far with any block-level styles.
				$block_level_data = $data['styles']['blocks'][ $block_type ]['variations'][ $variation_name ] ?? array();
				if ( ! empty( $block_level_data ) ) {
					$variation['styles'] = array_replace_recursive( $variation['styles'], $block_level_data );
				}

				$path = array( 'styles', 'blocks', $block_type, 'variations', $variation_name );
				_wp_array_set( $data, $path, $variation['styles'] );
			}
		}

		return $data;
	}

	/**
	 * Adds variations sourced from the block styles registry to the supplied theme.json data.
	 *
	 * @since 6.6.0
	 *
	 * @param array $data Array following the theme.json specification.
	 * @return array Theme json data including shared block style variation definitions.
	 */
	private static function inject_variations_from_block_styles_registry( $data ) {
		$registry = WP_Block_Styles_Registry::get_instance();
		$styles   = $registry->get_all_registered();

		foreach ( $styles as $block_type => $variations ) {
			foreach ( $variations as $variation_name => $variation ) {
				if ( empty( $variation['style_data'] ) ) {
					continue;
				}

				// First, override registry styles with any top-level styles.
				$top_level_data = $data['styles']['variations'][ $variation_name ] ?? array();
				if ( ! empty( $top_level_data ) ) {
					$variation['style_data'] = array_replace_recursive( $variation['style_data'], $top_level_data );
				}

				// Then, override styles so far with any block-level styles.
				$block_level_data = $data['styles']['blocks'][ $block_type ]['variations'][ $variation_name ] ?? array();
				if ( ! empty( $block_level_data ) ) {
					$variation['style_data'] = array_replace_recursive( $variation['style_data'], $block_level_data );
				}

				$path = array( 'styles', 'blocks', $block_type, 'variations', $variation_name );
				_wp_array_set( $data, $path, $variation['style_data'] );
			}
		}

		return $data;
	}
}