No, I didn’t see anything obviously wrong when I checked the Environment Variables. The DUPLICATI__SERVER_DATAFOLDER was set to /config like the dockerfile you referenced.
I also updated from 2.1.0.4 to 2.1.0.5, and after doing so I was unable to get duplicati-server-util to run at all. It gave a different error, but I didn’t dig into it since I was able to reach the UI. I’ll take a look tonight and post the new error here. I’m also on the linuxserver discord, so I can ask there for some details as well.