rclone: rclone can not copy object from s3 to s3 and the key is "a//"?

What is the problem you are having with rclone?

rclone can not copy object from s3 to s3 and the key is “a//”?

What is your rclone version (output from rclone version)

Which OS you are using and how many bits (e.g. Windows 7, 64 bit)

CentOS Linux release 7.4.1708 (Core)

Which cloud storage system are you using? (e.g. Google Drive)

ceph rgw(s3)

The command you were trying to run (e.g. rclone copy /tmp remote:tmp)

rclone copy

A log from the command with the -vv flag (e.g. output from rclone -vv copy /tmp remote:tmp)

rclone.conf:

@ncw @darthShadow Please take a look.