How do I create an uncacheable field plugin base?
May be you can try :

use Drupal\Core\Cache\CacheableDependencyInterface;
use Drupal\views\Plugin\views\field\UncacheableFieldHandlerTrait;

class MyFieldPluginBaseCustom extends FieldPluginBase implements CacheableDependencyInterface  {

    ...
    public function render(ResultRow $values) {
        //do some work with the current node (the current row view)
        if(node_parameter_test_isOK() == true) 
            return "string A";
        }    
        else{
            return "string B";
        }
    }
  public function getCacheMaxAge() {
    return 0;
  }
  public function getCacheContexts() {
    return [];
  }
  public function getCacheTags() {
    return [];
      }
}