When I select the ko-KR option for the nova-2 model and publish it, it automatically returns to the original en option. is this a bug?

yes me too

Please a temporary fix you can use create new assistant with same configurations. It will work or create it via api

This has been fixed.

Hey @John , This issue was fixed a couple of days back. Could you hit a hard refresh and try changing settings on a new assistant? Let me know if you still face any errors.