Restoring kubelet config from backup fails

I'm getting this error in each worker server after restoring from backup:
$ journalctl -u k0sworker.service

level=info msg="Starting kubelet"
level=warning msg="failed to get initial kubelet config with join token: failed to get kubelet config from API: Unauthorized"
level=warning msg="failed to get initial kubelet config with join token: failed to get kubelet config from API: Unauthorized"
...

$ k get nodes
NAME STATUS ROLES AGE VERSION
s504des204k0s NotReady 9d v1.23.5+k0s
s504des205k0s NotReady 9d v1.23.5+k0s

I've a cluster backup using this command:
k0sctl backup -c k0s-des-airgap.yml --disable-telemetry --disable-upgrade-check

I've reset all nodes with k0sctl reset -c k0s-des-airgap.yml --disable-telemetry and I've tried to restore with this command:

k0sctl apply --restore-from k0s_backup_1649314850.tar.gz -c k0s-des-airgap.yml --disable-telemetry

I've three master nodes and two worker nodes.

I'm running k0sctl v0.12.6 and k0s v1.23.5+k0s with airgap config

Thanks.