DO12.28 vs Ubuntu22.04 rejects public key (20.04 OK)

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As a workround: adding one line in /etc/ssh/sshd_config below

#PubkeyAuthentication yes

Make it read as:

#PubkeyAuthentication yes
PubkeyAcceptedKeyTypes=+ssh-rsa

and then do a

$ grep Pub /etc/ssh/sshd_config
#PubkeyAuthentication yes
PubkeyAcceptedKeyTypes=+ssh-rsa
$ sudo systemctl restart sshd

It makes DO12.18 work with SFTP of Ubuntu 22.04 again.

But, it allows deprecated ssh-rsa auth method, which give your server a tiny risk of being attacked in theory.