When options.OnIntermediateMessage is null, the method does not yield any response, which differs from the previous behavior that always yielded a response. It is recommended to yield responses regardless of the callback, for example, by yielding the responseItem in an else branch.

[Bryan-Roe]

When options.OnIntermediateMessage is null, the method does not yield any response, which differs from the previous behavior that always yielded a response. It is recommended to yield responses regardless of the callback, for example, by yielding the responseItem in an else branch.

Originally posted by @Copilot in #749 (comment)