Bad Request: group chat was upgraded to a supergroup chat

This happens sometimes, especially when using the broadcast feature. It's likely that we could be able to send the message if we correctly handle this upgrade?

The issue does not name a file, test, or entry point. Start by tracing the broadcast feature and its handling of Telegram API errors, then identify where group-to-supergroup upgrades are reported. Done means the affected message can be sent or the upgrade is handled without leaving the broadcast in a failed state.

Written by the indexing model from the issue text.