welcome to the fourm,
that is strange, not sure what the issue is
might check out my howto guide about rclone+smb.
fwiw, the rclone smb remote has some serious limitations, so, i never use it.
in your case, the source and dest are local and/or smb
so, i would follow my guide. that way, get native os mounting and rclone can verify file transfer using checksums.
- use
net useto mount the smb share - use rclone to do the file copy.
for the last ten years, i have been using fastcopy. verifies file transfers, works on command line, has a gui, easy to integrate with double commander, total commander and as per its name, very fast.