Export Package Does Not Respect Select Dependencies - Includes Everything

Steps To Reproduce:
1. Open project on OSX or Win
2. Export As Package the prefab PlayerOne.prefab in the folder Prefabs.
3. Observe: Include Dependencies is selected but all assets are included in the export.
NOTE: DoTween is used as an example here. Can also reproduce independently of DoTween (use Cinemachine instead)

Expected Behaviour: Only the dependencies should be included
Actual Behaviour: All assets are included in the package export

Reproduced in 2017.3 and 2017.2.
See attached video. Additional gif provided by Mike Geig.

License type: Pro