To reproduce:
1. Open attached project
2. Open scene game, it has a couple of cards which are animated using the legacy animation
3. In the scene view switch to orthographic view and rotate it to either the left or right position with the camera gizmo. This should make the cards invisible in the scene view
4. Enter play mode - notice how the cards rotate during the animation but remain visible from the scene view even though their rotation is 0

Changing a transform value will return the card to normal
Appears to be an issue with the legacy animation

Legacy animation is not supported.