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.
There’s a bug where flatpaks seemingly disappear from the system the first time you run Wayland. But it resolves with a reboot. It happens too if you change back from Wayland to X11. Other than some minor glitches from very old software that hasn’t seen an update in decades, it runs perfectly fine.