So, upgraded in-place from SourceBans++ 1.6.4 to 1.7.0 successfully (with required upgrade to PHP 8.1+).
However, I had the previous setup configured to only allow admins to login to the web-panel using Steam authentication. Which now seems broken after the upgrade.
Anybody know how to fix that? re-enable the default non-Steam login and fix the Steam-based authentication for the web-panel?