It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
Did Matt try putting the regular build on a newish machine? That’s what I did with my current and was struggling until I put the latest kernel on it, should have gone with Edge, but had little trouble after)