if BE's tablet not contains a txn, publish txn on them will no error, when check version exists it will indicate the tablet as error_tablet_id in task's response, so FE can know this tablet has fail. Also for task, it's no need to set its status as "VERSION_NOT_EXIST". Because if set it as not ok, the BE will try this task two times. Since not contains this tablet's txn, the retry is in vain.