Modulated Shadows on IOS cause flickering on Skeletal Meshes

Modulated shadows are not functioning properly on IOS devices for skeletal meshes. Any skeletal meshes in the scene will cast a shadow, but have a flickering modulated shadow on the skeletal mesh as well. Reference image attached for comparison of skeletal and static meshes that are set to movable.

This appears to have been an issue with IOS in 4.9.2, 4.10, and 4.11 p5.

I attempted to build IOS project in 4.12(Main and Dev-Mobile), but had packaging issues.

1. Open UE4
2. Enable Modulate Shadows on a directional light
3. Place a skeletal Mesh in the scene (any will do)
4. Build Lighting
5. Launch on an IOS device.

Results: Modulated shadows flicker for any skeletal meshes in the scene when launched on an IOS device. This does not occur on Android.

Expected: Modulated shadows should not flicker on IOS devices.

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