Bot API 10.3, MessageGenerationStopped contains the bot's own chat instead of the target private chat

[Meosit]

In Bot API 10.3, stopped_message_generation.chat does not match the documented MessageGenerationStopped contract when a user stops generation in a private bot forum topic.

The update contains the bot's own identity instead of the private chat/user to which the draft was sent.

This prevents applications from locating the corresponding active response through the documented chat identity. A bot may consequently ignore the stop request and continue generating and later send the final response.

Documentation: https://core.telegram.org/bots/api#messagegenerationstopped

Bot API version

Bot API 10.3

Bot API source:

telegram-bot-api/telegram-bot-api/Client.cpp

Lines 3980 to 3992 in 2efabc7

	class Client::JsonMessageGenerationStopped final : public td::Jsonable {
	public:
	JsonMessageGenerationStopped(const td_api::updateStopMessageDraft *update_stop_message_draft, const Client *client)
	: update_stop_message_draft_(update_stop_message_draft), client_(client) {
	}
	void store(td::JsonValueScope *scope) const {
	auto object = scope->enter_object();
	object("chat", JsonChat(update_stop_message_draft_->chat_id_, client_));
	if (update_stop_message_draft_->forum_topic_id_ != 0) {
	object("message_thread_id", update_stop_message_draft_->forum_topic_id_);
	}
	object("draft_id", td::to_string(update_stop_message_draft_->draft_id_));
	}

Steps to reproduce

1. Enable forum/topic mode for a bot.

2. Receive a message from a user in a private chat topic.

   {
     "chat": {
       "id": "<USER_ID>",
       "type": "private"
     },
     "from": {
       "id": "<USER_ID>"
     },
     "message_thread_id": 1605752
   }

3. Stream a rich-message draft to <USER_ID> in that topic with can_stop=true.

4. Press Telegram's native “Stop generation” button.

5. Inspect the resulting stopped_message_generation update.

Actual result

The update contains the bot's own private-chat identity:

{
  "stopped_message_generation": {
    "chat": {
      "id": "<BOT_ID>",
      "first_name": "<BOT_NAME>",
      "username": "<BOT_USERNAME>",
      "type": "private"
    },
    "message_thread_id": 1605752
  }
}

The value of stopped_message_generation.chat.id equals getMe().id, not the chat_id supplied when sending the draft.