code: async def flush(self, request: BernardRequest):
          
  
          if self._acq and 'callback_query' in self._update:
              try:
                  cbq_id = self._update['callback_query']['id']
              except KeyError:
                  pass
              else:
                  await self.platform.call(
                      'answerCallbackQuery',
                      **(await self._acq.serialize(cbq_id))
                  )
  
          return await super(TelegramResponder, self).flush(request)
docs: If there's a AnswerCallbackQuery scheduled for reply, place the call
          before actually flushing the buffer.