Editor claims BC7 texture format is not supported for Universal Windows Platform when it actually works fine

Repro steps:

1. Open the attached project.
2. Click on "Assets/Untitled.png" in the project.
3. Navigate to the inspector and change texture format to BC7.
4. Hit apply.
5. Notice this error message in the console:

Selected texture format 'RGB(A) Compressed BC7' for platform 'Windows Store Apps' is not valid with the current texture type 'Image'.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Note that if you build to Universal Windows Platform and use the texture, it will work just fine and will actually use BC7 format.