i adjusted that to your suggestions, but it does not help.
I enabled debug logging in rclone and tested with another s3 client, where the directory listing is there within a second.
Client → timeout after 60 sec:
2025/08/21 08:30:50 DEBUG : serve s3: LIST BUCKET
2025/08/21 08:30:50 DEBUG : serve s3: bucketname:%!(EXTRA string=backup, string=prefix:, gofakes3.Prefix=prefix:"pcloud/.chunks/", string=page:, string={Marker: HasMarker:false MaxKeys:1000})
Client → directory listing within 2sec:
2025/08/21 08:33:43 DEBUG : serve s3: LIST BUCKET
2025/08/21 08:33:43 DEBUG : serve s3: bucketname:%!(EXTRA string=backup, string=prefix:, gofakes3.Prefix=prefix:"pcloud/.chunks/", delim:"/", string=page:, string={Marker: HasMarker:false MaxKeys:1000})
The only difference is the delim:”/”.
The documentation says that in case delimiter is empty, it will treat it as /,