OCIS + Authelia + Traefik: Error 401 when uploading a file from the web interface

Using OCIS 5.0.6 docker image, I'm unable to upload any file using the web interface.
I have Traefik in front of OCIS, and Authelia setup as external OIDC. Traefik is configured to forward auth to authelia, and login is working fine, but when I try to upload a file, there is a 401 error in the logs.

I believe the issue is one of the microservice is trying to access to OCIS by using the public url, instead of using localhost, because I see logs in traefik with requests coming from one of my docker ipv6 gateway.

Log from OCIS:
```
2024-08-06T20:48:04Z INF access-log bytes=0 duration=47.885004 line=github.com/owncloud/ocis/v2/services/proxy/pkg/middleware/accesslog.go:34 method=POST path=/remote.php/dav/spaces/71f13446-3085-4a58-86df-aea050a78676$06c41f70-95b4-4f40-9006-bf215d037e37 proto=HTTP/1.1 remote-addr= request-id=a3fc6fbe-e909-4f43-822c-998b44af3c61 service=proxy status=401 traceid=5465487ca28380b091be737a4da133e6
```
Log from Traefik:
```
{"ClientAddr":"[fd9a:78e:85ba::1]:42554","ClientHost":"fd9a:78e:85ba::1","ClientPort":"42554","ClientUsername":"-","DownstreamContentSize":366,"DownstreamStatus":401,"Duration":3143168,"GzipRatio":0,"OriginContentSize":0,"OriginDuration":0,"OriginStatus":0,"Overhead":3143168,"RequestAddr":"","RequestContentSize":0,"RequestCount":3380,"RequestHost":"","RequestMethod":"PATCH","RequestPath":"/data/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJyZXZhIiwiZXhwIjoxNzIzMDYzNjg0LCJpYXQiOjE3MjI5NzcyODQsInRhcmdldCI6Imh0dHA6Ly9sb2NhbGhvc3Q6OTE1OC9kYXRhL3R1cy9kZDNiODE0NC1hMDg0LTRhMjctYmJkYS1kYjYzYzRlYTE1NDIifQ.Doa-P_xFcB9oV-nBPS_U6zQ_Ki4hgW8bG5pZcpPKewc","RequestPort":"-","RequestProtocol":"HTTP/2.0","RequestScheme":"https","RetryAttempts":0,"RouterName":"to-ocis@file","StartLocal":"2024-08-06T22:48:04.547730109+02:00","StartUTC":"2024-08-06T20:48:04.547730109Z","TLSCipher":"TLS_AES_128_GCM_SHA256","TLSVersion":"1.3","entryPointName":"https","level":"info","msg":"","time":"2024-08-06T22:48:04+02:00"}
```

This request is forwarded by Traefik to Authelia which denies the access.
Any idea if I can force the service to use localhost for connecting to other service?