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A week later, at a vendor conference talk, Anton sat in the back as a Siemens engineer presented a deep-dive on the fix. The failure had been rare but insidious: a race condition in the download handshake triggered when an OB table contained both legacy OBs and newer streaming-observer blocks. Under certain timing patterns the packet acknowledgments could be misread as duplicate frames; the CPU’s transfer engine, detecting what looked like a repeat, would abort rather than reconcile. The patch introduced a small, deliberate delay and tightened session state validation so the CPU would see the full transfer correctly. It was elegant in its simplicity—fixes often are after being found.