From GitHub: https://github.com/Unity-Technologies/InputSystem/issues/365

Repro:
1. Download ISX package: https://github.com/Unity-Technologies/InputSystem
2. Right click in the Project tab, Create -> Input Actions
3. Give it a name and double click to open Input Action UI
4. Create an Action Map in the most left column
5. Create an Action for the Map in the middle column
6. Select the action, for the Type option in the right column, choose "Vector2" from the drop down menu.
7. Select the Binding under the action (middle column), click on the dropdown menu for Path (right column)
8. Search "dpad" and observe the result.

Expected: Dpad for all gamepads are available for Vector2 Type Action