Sorry, I just peeked at the config options and have never run any of this so no idea about the interaction with Lemmy or how to troubleshoot that. What I’d do though is spin up a toy instance on another subdomain/locally in a container and try to reproduce it there. Maybe with a copy of the data from production if that’s easy enough to pull off.

But ya only in retrospect - I wouldn’t have expected changing the banner or icon to be a risky operation.