Run 2 messages by assistant API in very short time. Each message contains an unique id in metadata. I got one answer and one error, that was expected, but the answer is not related to the correct unique id.
For example:
{id: 1, msg: question-1}
{id: 2, msg: question2}
It may get the answer of question2 but with id: 1. I feel it is easy to reproduce.