Have you had a look in your moonraker.log? You could also post it. From your klippy.log:
mcu ‘mcu’: Starting serial connect
mcu ‘mcu’: Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: ‘/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0’
Did you do Frequently Asked Questions - Klipper documentation Where’s my serial port?
Could also be this one Debian Bullseye Bug causing Klipper to no longer find the printer board
Good luck, hcet14