Implements hook_contextual_links_view_alter().
\Drupal\contextual\Plugin\views\field\ContextualLinks::render()
function contextual_contextual_links_view_alter(&$element, $items) {
if (isset($element['#contextual_links']['contextual'])) {
$encoded_links = $element['#contextual_links']['contextual'][2]['contextual-views-field-links'];
$element['#links'] = drupal_json_decode(rawurldecode($encoded_links));
}
}