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Are other identical MCUs from the same batch? Are markings and package exactly the same?
it's the last 4 sectors, top 512K, the ones that would be absent on a 512k part.
You might be surprised just how absent they aren't...!I've certainly found perfectly good flash memory where it shouldn't exist on smaller STM32 parts - just don't rely on it being there or working.
If I were you I'd just swap the chip and forget about it. If the fault happens again, then investigate.