Move operation doesn't work/update cache

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Reproduce steps

1. Mount gdfs in /gdfs
2. Create a directory /gdfs/foo
3. (optional) Create a file in the new directory (echo 1 > /gdfs/bar/file.txt)
4. Create second directory /gdfs/bar
5. Move /gdfs/foo into /gdfs/bar: mv /gdfs/foo /gdfs/bar/

Expected

Directory is moved and visible at new path: /gdfs/bar/foo

Actual

1. The directory doesn't exist at target path:

$ ls /gdfs/bar/foo
ls: cannot access '/gdfs/bar/foo': No such file or directory

2. The directory is still visible in the original path.

   $ ls /gdfs/foo
   file.txt