Shangjie Chen
99179223d0
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When running with a mocked `SessionService` whose `append_event` returns a `Mock` object, `user_event.branch` dynamically evaluates to an `AsyncMock`/`MagicMock` instead of `None` or a `str`. Guarding with `isinstance(..., str)` ensures `invocation_context.branch` is only updated when a real string branch is present, preventing downstream Pydantic validation and Proto conversion errors. Co-authored-by: Shangjie Chen <deanchen@google.com> PiperOrigin-RevId: 970212560