Viewport camera teleports to past position on Alt + LMB + Drag after camera cut lock

When you unlock the viewport from "Lock viewport to Camera Cuts" of a camera cut, tumbling the camera can teleport the view into the camera's previous(before entering the camera cut) position and tumble using the previous pivot.

1. Open attached scene
2. Focus(f) on the sphere
3. Open NewLevelSequence
4. Use "Lock viewport to Camera Cuts" this will show the cube in the viewport
5. Click the lock button again to unlock the viewport(Cube is still displayed)
6. Use Alt + LMB + Drag to tumble the view to see the viewport suddenly teleports back to Sphere and tumble around Sphere

Expected result: Step 6 would tumble around the cube(or at least not jumping some other place suddenly)

Note: If you tweak the view a bit(such as RMB +drag) before step 6, teleport does not happen