"Subsystem 'sftp' already defined" error in openssh-9 when using Include

[Martin Schröder]

Am Mi., 2. Aug. 2023 um 23:27 Uhr schrieb Artem Russakovskii
<archon810 at gmail.com>:
> For the last several releases (perhaps with the release of openssh 9?),
> upgrading each version  of openssh started wiping the current sshd_config
> and replacing it with the default config, at least on OpenSUSE 15.4 via
> zypper/yast.

Where do you get your sshd from? The default openssh-server for 15.5 is 8.4.
And here configs are typically not overwritten; .rpmnew

Best
    Martin