Thanks. Whole problem lies in Microsoft Win8.1+ (and higher) bug (errr, they called it "feature by design"), that it does not report all CPU-supported features when Hyper-V is enabled (i.e. when Hyper-V is disabled, it reports "Skylake-based processors", but when Hyper-V is enabled, it reports "Core 2 Duo 8000 series").
I will try to develop some workaround but I must ensure that it does not influence backward-compatibility.