Crash when using +CVars=r.MobileContentScaleFactor=2

Iphone 6 Plus crashes when using +CVars=r.MobileContentScaleFactor=2, but it will run if you use +CVars=r.MobileContentScaleFactor=1. The project linked is set up with +CVars=r.MobileContentScaleFactor=2.

4987_iPhone6+ (Apple A8; 9.1.0) - Error occurs
5065_iPhone5S (Apple A7; 9.2 (13C75)) - Works fine
4022_Nexus5 (Adreno 330; 6.0) - Works fine

1. Download project: [Link Removed]
2. Launch onto the Iphone 6Plus

Result: The project will crash once opened.
Expected: The project should run

Fix UE-51650

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