Remove registration from wp_theme_json_data_* filters

src/wp-includes/block-supports/block-style-variations.php

@@ -231,7 +231,6 @@ function wp_resolve_and_register_block_style_variations( $variations ) {
 		return $variations_data;
 	}
 
-	$registry              = WP_Block_Styles_Registry::get_instance();
 	$have_named_variations = ! wp_is_numeric_array( $variations );
 
 	foreach ( $variations as $key => $variation ) {
@@ -254,22 +253,8 @@ function wp_resolve_and_register_block_style_variations( $variations ) {
 		 * 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_label = $variation['title'] ?? $variation_name;
 
 		foreach ( $supported_blocks as $block_type ) {
-			$registered_styles = $registry->get_registered_styles_for_block( $block_type );
-
-			// Register block style variation if it hasn't already been registered.
-			if ( ! array_key_exists( $variation_name, $registered_styles ) ) {
-				register_block_style(
-					$block_type,
-					array(
-						'name'  => $variation_name,
-						'label' => $variation_label,
-					)
-				);
-			}
-
 			// Add block style variation data under current block type.
 			$path = array( $block_type, 'variations', $variation_name );
 			_wp_array_set( $variations_data, $path, $variation_data );