问块插件的呈现数组值以$variables['content']结束，而不是$variables

EN

function my_module_theme(){
  return [
    'block__my_module__user_header' => [
      'render element' => 'children', // also tried without this
      'variables' => [
        'tabs' => NULL,
        'user' => NULL,
      ],
    ],
  ]
}

public function build() {

  $render_array = [
    '#theme' => 'block__my_module__user_header',
    '#tabs' => $this->getTabs(), // returns an array of data to handled in twig
    '#cache' => [
      'contexts' => [
        'route',
        'user',
      ],
    ],
  ];

  if ($user = $this->getContextValue('user')) {
    $render_array['#cache']['tags'] = $user->getCacheTags();
    $render_array['#user'] = $user;
  }

  return $render_array;
}