It sounds like they implemented some Spectre/Meltdown type security feature involving cache invalidation that are 'currently' unnecessary for AMD. For some reas

It sounds like they implemented some Spectre/Meltdown type security feature involving cache invalidation that are 'currently' unnecessary for AMD. For some reason none of the articles make it clear if it's only seen on Zen 1/2 or if Zen 3 is affected since the memory topology of Zen 2 has caused issues in the past. This is quite bad considering how Microsoft was upfront about Windows 11 being better designed for Intel's Alder Lake CPUs which have two distinct core types. So it's incredibly weird that Windows 11 would interfere with AMD's preferred core technology since it's comparatively normal. It's pretty obvious that regression testing on AMD platforms just wasn't done.