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exit_delta_task_id puts the superstep in the first UUID group. For a Command's writes in a run whose first superstep is 0, such as one that starts from an update_state(..., as_node="__input__") checkpoint, that gave NULL_TASK_ID itself, so get_state and later runs took the writes for the checkpoint's own pending writes. The DeltaChannel then read the update on that checkpoint and a replay from it applied it again, while a plain channel did neither.