I have 3 opn tunnels running. Well, I had it when I ran 21.7.8
After upgrading to 22.1.8_1 I get
wg0: link state changed to UP
wg0: link state changed to DOWN
wg0: changed name tp 'wg1'
wg1: link state changed to UP
wg1: link state changed to DOWN
wg0 changing name to 'wg2'
wg2: link state changed to UP
This means I only have one wireguard connection: wg2
I have another opnsense box at 22.1.8_1 with 3 working wg-interfaces.
Did you ever find a solution? I have the same problem after updating.
Edit: I just created a new wg interface with the wg0 config and disabled wg0 ...