Remove building wp_template_parts variation call for frontend

src/wp-admin/includes/post.php

@@ -2330,6 +2330,11 @@ function get_block_editor_server_block_settings() {
 
 			$blocks[ $block_name ][ $key ] = $block_type->{ $field };
 		}
+
+		// If the block has a variations callback, call it and add the variations to the block.
+		if ( is_callable( $block_type->variations ) ) {
+			$blocks[ $block_name ]['variations'] = call_user_func( $block_type->variations );
+		}
 	}
 
 	return $blocks;

src/wp-includes/blocks/template-part.php

@@ -276,7 +276,7 @@ function register_block_core_template_part() {
 		__DIR__ . '/template-part',
 		array(
 			'render_callback' => 'render_block_core_template_part',
-			'variations'      => build_template_part_block_variations(),
+			'variations'      => 'build_template_part_block_variations',
 		)
 	);
 }

src/wp-includes/class-wp-block-type.php

@@ -113,7 +113,7 @@ class WP_Block_Type {
 	 * Block variations.
 	 *
 	 * @since 5.8.0
-	 * @var array[]
+	 * @var array[] | callable
 	 */
 	public $variations = array();