bug: Observations API v2 traceName becomes null for generation records starting ~2026-09-15 (Langfuse Cloud)

该报错通常出现在 Langfuse Cloud 上用 Python SDK v4 导出 GENERATION observation 时,子 generation 的 traceName 返回 null ,而同一 traceId 的根 observation 仍有 traceName 。优先排查是否
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