CiviCRM logging timestamp weird bug (CRM/Logging/Schema.php)

civicrm_CRM_Logging_Schema.php

  /**
   * Fix timestamp.
   *
   * Log_civicrm_contact.modified_date for example would always be copied from civicrm_contact.modified_date,
   * so there's no need for a default timestamp and therefore we remove such default timestamps
   * also eliminate the NOT NULL constraint, since we always copy and schema can change down the road)
   *
   * @param string $query
   *
   * @return mixed
   */
  public function fixTimeStampAndNotNullSQL($query) {
    $query = str_ireplace("TIMESTAMP NOT NULL", "TIMESTAMP NULL", $query);
    $query = str_ireplace("DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP", '', $query);
    $query = str_ireplace("DEFAULT CURRENT_TIMESTAMP", '', $query);
    $query = str_ireplace("NOT NULL", '', $query);
    $query = str_ireplace('()', ' ', $query); // [ML]
    return $query;
  }