event.answer(url) not working when handled with bot.add_event_handler

[pdisk]

event.answer(url="t.me/botname/start?=hi") not working when handled with client.add_event_handler() to assign event handlers
its working fine when I use @client.on(event) (decorator method) instead of add_event_handler()

Traceback

File "C:\Users\..\Python310\lib\site-packages\telethon\client\updates.py", line 467, in _dispatch_update
    await callback(event)
  File "C:\Users\..\event_handlers.py", line 213, in upl
    await e.answer(url=f"https://t.me/{await bot_username(client)}?start=hi")
  File "C:\Users\...\telethon\events\callbackquery.py", line 244, in answer
    return await self._client(
  File "C:\Users\...\Python310\lib\site-packages\telethon\client\users.py", line 30, in __call__
    return await self._call(self._sender, request, ordered=ordered)
  File "C:\Users\...\Python310\lib\site-packages\telethon\client\users.py", line 84, in _call
    result = await future
telethon.errors.rpcerrorlist.QueryIdInvalidError: The query ID is invalid (caused by SetBotCallbackAnswerRequest)

[Lonami]

@client.on(...) simply calls client.add_event_handler():

Telethon/telethon/client/updates.py

Lines 100 to 125 in 5080715

	def on(self: 'TelegramClient', event: EventBuilder):
	"""
	Decorator used to `add_event_handler` more conveniently.
	Arguments
	event (`_EventBuilder` | `type`):
	The event builder class or instance to be used,
	for instance ``events.NewMessage``.
	Example
	.. code-block:: python
	from telethon import TelegramClient, events
	client = TelegramClient(...)
	# Here we use client.on
	@client.on(events.NewMessage)
	async def handler(event):
	...
	"""
	def decorator(f):
	self.add_event_handler(f, event)
	return f
	return decorator

Could you post a small code sample needed to reproduce the issue? What steps should I take while running the code to see the behavior you describe?

[pdisk]

It's Working when i made a test code but its not working in production with as many as 5bots with 800k users all running on same code

Maybe its cuz the event is taking too much time to get processed idk

[Lonami]

I am unable to reproduce this issue (I tried with your URL, and also t.me/botname?start=hi, as well as with https:// before both, but it kept failing with URL_INVALID).

I am going to close this under the assumption that the problem was in fact a timeout as you point out (I do get the error you describe if I put a normal answer('text'), with a long asyncio.sleep just before).

If you manage to reproduce this issue again, have a way for me to reliably trigger the error, and are certain it's not timing out (by noticing that the time between click and response is fast enough), let me know, and we can reopen the issue.