SunTemple scene does not update properly on iPhone 6S

On the 6S, the SunTemple scene is almost unresponsive. As the player uses the thumbsticks, the lightmaps from the windows rotate to mach the player's movement; but they are the only thing.

This doesn't occur in 4.16 on the same device.
On the affected devices, I loaded the blank template level without any artifacting.

Devices this occurs on:
iPhone 6S on 10.3.2
iPhone 6S on 11

It does not occur on:
iPad Pro 9.7" on 11
iPad Mini4 on 9.3.5

1. Download Release 4.17 and the SunTemple showcase (on Windows)
2. In the editor, use File > Package to make the app
3. Deploy to a 6S and run it
4. Use thumbsticks to move around

RESULT: Most rendering in the scene does not update to reflect player movement.