Bad Request: chat not found

[usadev1984]

based on the documentation, my bot should be able to respond to a message without specifying the chat id if the message is in the same chat. however when i try something like the following code to respond to a message a user sent to the bot directly in dm:

const char * reply = "You're already in the chat.";
TgBot::ReplyParameters rp_params;
rp_params.allowSendingWithoutReply = true;
rp_params.messageId = ev->messageId;

bot->getApi().sendMessage(ev->chat->id, reply, nullptr, std::make_shared<TgBot::ReplyParameters>(rp_params));

i get Bad Request: chat not found. the only way around it is to provide the chat id. so for example the following works:

const char * reply = "You're already in the chat.";
TgBot::ReplyParameters rp_params;
rp_params.allowSendingWithoutReply = true;
rp_params.messageId = ev->messageId;
rp_params.chatId = ev->chat->id;

bot->getApi().sendMessage(ev->chat->id, reply, nullptr, std::make_shared<TgBot::ReplyParameters>(rp_params));

am i doing something wrong? im using the latest version of the library btw.