gsutil cp command copies entire directory path (on Windows) - bug?

I am having a problem where gsutil does not seem to follow the behavior described in the documentation (at least in Windows). The documentation states: When performing recursive directory copies, object names are constructed that mirror the source directory structure starting at the point of recursive processing. For example, the command: ``` gsutil cp -R dir1/dir2 gs://my_bucket ``` will create objects named like `gs://my_bucket/dir2/a/b/c`, assuming `dir1/dir2` contains the file `a/b/c`. However, in practice I have found that it will create objects named: ``` gs://my_bucket/dir1/dir2/a/b/c ``` ie, it copies the entire directory path stated in the `gsutil` command, rather than "starting at the point of recursive processing" (dir2) as stated in the documentation. Am I missing/misunderstanding something here?