Change of Instructions in Assistant will not work in old threds

While chatting, backend I added this into Instructions “Must respond or answer in Japanese”, seem like it not apply to the current thread id, and i need to change the thread id.

Is that correct?

I tested using additional_instructions. It is unreliable to change the language in the middle of conversation. Sometimes it changes, sometimes not.

The pink dot is where I change to Japanese and green dot where I change back to English. As you can see, it won’t change back to English by the end.

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