bug: startActiveObservation with asType does not write observation type to span unless .update() is called

用户在使用 @langfuse/tracing SDK(版本约 5.3.0)时,通过 startActiveObservation 创建观察(observation),并指定 asType 为 "chain" 、 "retriever" 或 "embedding" 等类型。问题仅影响 startAc


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