ChatAnthropic streaming drops thinking field from empty thinking blocks (signature_delta-only), replay fails with 400 thinking.thinking: Fie

当 Anthropic 流式返回一个 空 thinking 块 (仅有 signature_delta,无 thinking_delta)时,ChatAnthropic 流处理会丢失 thinking 字段,回放该消息到下一轮请求时 API 返回 400 thinking.thinking: Fie








