Docker deployment, seahub error 500 on versions after 11.0.3

Nothing changed, running with recommended docker-compose.yml with non_root = true. Anybody else experiencing similar problems? Cannot find anything in the logs, except nginx saying seahub is throwing a 500:

2024/02/17 13:00:52 [error] 57#57: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.16.208.4, server: files.xxx
r.me, request: “GET / HTTP/1.1”, upstream: “http://127.0.0.1:8000/”, host: “files.yxz.zz”
2024/02/17 13:00:52 [error] 57#57: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.16.208.4, server: yxz.zz request: “GET /favicon.ico HTTP/1.1”, upstream: “http://127.0.0.1:8000/favicon.ico”, host: “files.xxx.me”, referrer: “https://files.xxx
ker.me/