Hi yup it was a kernel bug. I re-installed EOS KDE (single boot) from scratch and I can now see CPU Fan speed again in sensors output.
Current System Info:
OS: EndeavourOS Linux x86_64
Host: ASUS TUF Gaming A17 FA706IH_FA706IH 1.0
Kernel: 5.19.12-arch1-1
Uptime: 52 mins
Packages: 1060 (pacman)
Shell: zsh 5.9
Resolution: 1920x1080, 1920x1080
DE: Plasma 5.25.5
WM: KWin
Icons: [Plasma], breeze-dark [GTK2/3]
Terminal: konsole
CPU: AMD Ryzen 5 4600H with Radeon Graphics (12) @ 3.000GHz
GPU: AMD ATI 05:00.0 Renoir
GPU: NVIDIA 01:00.0 NVIDIA Corporation TU117M
Memory: 5025MiB / 31518MiB