@ipstas @SanderK is the issue still occurring on your side, and have you tested any later releases?
I wasn’t able to reproduce the issue on a fresh installation, neither on v15 nor v16. In my tests, both SSH and SFTP work as expected, and the sshd_config and sftpd_config files are present in /data/ssh/.
If the issue is still present, could you please provide a bit more detail about your setup so we can investigate further?