Oxidisation
"defects with early Raptor Lake batches, which stems from oxidized vias."
Reminds me of the issues with WD hard drives and oxidised pads for the headstack contacts on their PCB's. Drives would fail to initialize, and appear to have surface or head failure. However, cleaning the headstack contacts with vinegar or an eraser would fire them straight into life. This would have to be repeated every so often. They didn't tin or plate contacts back then, now they do, they no longer suffer.