There were sellers buying the smallest RAM units, changing the RAM chips, and then reselling them as the higher RAM SKUs. The sellers who do this don’t always care to use good RAM chips and may even use QA reject parts. When the unit doesn’t work correctly, the anger and RMA requests are directed back at the Raspberry Pi foundation.
The part replacement isn't being blocked? The OP's CM5 with replaced RAM is still a working CM5 according to him. And fully functional compared to before the replacement.
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