9950X3D + ASUS ProArt X870E -> Corrected error always freezes the system and never get recorded

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I am using 9950X3D + ASUS ProArt X870E system with V-Color 64GBx2 JEDEC 6400MHz ECC UDIMM, downclocked to 6200CL32.

Since the system does not support soft error injection, I have overclocked the memory into unstable state and run (1) memtest86 pro and (2) y-cruncher/stress-ng/memtester on Linux.

With ECC disabled in BIOS, I can see the thousand (uncorrected) errors reported but the system manages to stay alive.

With ECC enabled, it just freezes in both cases without (1) ECC errors recoreded in memtest86 pro or (2) MCE errors recoreded in rasdaemon DB.

Any help?

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PS. When ECC is enabled, at least I (usually) do not observe uncorrected error; It just freezes.