Steps to reproduce:

Using 5.3:
1. Open attached project "788944for5.3.zip"
2. Open scene "Test"
3. Change Graphics API to DX9 (or OpenGLCore)
4. Shadow should appear in scene view as well as in game view
5. Make sure that "Extra camera" found in hierarchy is enabled
6. Move "Extra camera" and notice that shadows aren't affected

Using 5.4:
7. Open the same project and scene using 5.4b15
8. Change graphics API to DX9
9. Shadow only appears in game view
10. Make sure that "Extra camera" is enabled
11. Move "Extra camera" and notice that shadow move together with camera

Reproduced with: 5.4.0b15
Not reproducible: 5.3.3f1, 5.3.4p3