gsutil mv - Not removing local directories after moved to buckets

I'm creating below directory structure

mkdir -p a/b/c
touch a/1 a/b/2

gsutil -D mv ./a gs://sftp-transfer

Once the command is executed successfully, I expect there should be no directories in the local machine since it is moved. But the directories a,b,c are all present.

The documentation says, mv will copy the contents to the bucket and remove them in the local. But in my case, the local directories are not removed.

Also on the other hand, the empty directory "c" is also not appearing in the bucket destination.