bot.Reply() results in error "telegram: Bad Request: message thread not found (400)" for supergroup [email protected]

[kettari]

Hello everyone,

I've encountered a specific error with the bot.Reply() method for supergroups when topics are turned off after being turned on. Steps to reproduce:

1. Turn on topics for a chat.
2. Turn off topics.
3. Send any message from the user to the chat.
4. Try to respond with bot.Reply() to that message.
5. Receive the error: telegram: Bad Request: message thread not found (400).

Logs show that messages now contain a non-zero field message_thread_id. However, since topics are turned off, the Telegram service can't find that thread.

A temporary workaround is to set the thread value to zero:

c.Message().ThreadID = 0
return c.Reply(msg)

Version [email protected]