catch_up doesnt fetch posts.

[julius425]

Code that causes the issue

I have problem with my bot doesnt see first posted messages if i add bot before i post something (with catch_up=True).

        # bot class implementation above
        await self.client.start(bot_token=self.bot_token)
        
        state = await self.client(GetStateRequest())
        logger.info(f"Current update state: {state}")
        
        await self.client.catch_up()
``

and 

```python
    TelegramClient(
            session=session,
            api_id=api_id,
            api_hash=api_hash,
            catch_up=True,
        )

Expected behavior

-create new channel,
-add bot,
-post a message.
-trying to fetch - new posts fetched.

Actual behavior

-create new channel,
-add bot,
-post a message.
-trying to fetch - no new posts fetched.
-post message,
-fetches ok.

If i fetched empty channel with bot in it before posting somthing to it (to sync session) nothing fetches as well

-create new channel,
-post something,
-add bot,
-post again
-new posts are fetched without problems.

Is this an expected behavior?

Traceback

Update state is the same in both success fetched and failed to fetch wariants
Current update state: State(pts=1, qts=0, date=datetime.datetime(2025, 3, 3, 8, 40, 6, tzinfo=datetime.timezone.utc), seq=1, unread_count=0)

Telethon version

1.36.0

Python version

3.11.11

Operating system (including distribution name and version)

macOS 15.3.1

Other details

No response

Checklist

• The error is in the library's code, and not in my own.
• I have searched for this issue before posting it and there isn't an open duplicate.
• I ran pip install -U https://github.com/LonamiWebs/Telethon/archive/v1.zip and triggered the bug in the latest version.