Logs flooded with 404 error for .../users/<alphanum>/received.json

My logs are flooded with this message:

{"level":"warn","service":"storage-system","pkg":"rhttp","traceid":"7a3af4fbc09bc9deb5a72b5fbf5795c5","host":"127.0.0.1","method":"GET","uri":"/data/spaces/jsoncs3-share-manager-metadata%21jsoncs3-share-manager-metadata/users/<redacted_alphanumerical>/received.json","url":"/users/<redacted_alphanumerical>/received.json","proto":"HTTP/1.1","status":404,"size":0,"start":"31/Oct/2025:14:04:50 +0000","end":"31/Oct/2025:14:04:50 +0000","time_ns":404774,"time":"2025-10-31T14:04:50Z","message":"http"}

I have OCIS running in a container with Authelia authentication with LLDAP backend. OCIS’ own IDP is disabled.
No other errors perceived. From an end user point of view, everything works.