drone-scp error: error copy file to dest: ***, error message: wait: remote command exited without exit status or exit signal

The script sometimes throws this error:

`drone-scp error: error copy file to dest: ***, error message: wait: remote command exited without exit status or exit signal`

It doesn't always happen, sometimes it works.
The /root path of the target server also contains the .tar file.

Start by reproducing the intermittent failure in the script while copying a .tar file to a target server whose /root path already contains that file. Capture the remote command and exit behavior when the error occurs, then verify the fix by repeating the copy in both failing and successful conditions.

Written by the indexing model from the issue text.