I am having a similiar issue. LEDs not available anymore.
My system is a NanoPi NEO, Bullseye, since updating to Armbian v22.05, the sys fs for leds is empty
dmesg
...
[ 2.585643] leds-gpio: probe of leds failed with error -16
...
[ 9.156390] systemd[1]: Starting Armbian leds state...
[ 9.320604] systemd[1]: armbian-led-state.service: Main process exited, code=exited, status=1/FAILURE
[ 9.323242] systemd[1]: armbian-led-state.service: Failed with result 'exit-code'.
[ 9.327544] systemd[1]: Failed to start Armbian leds state.
...
ls /sys/class/leds
<intentionally left empty>
Any new ideas, where to start?