To reproduce:
1. Open attached project "testcase.zip"
2. Open "testscene.unity" scene
3. Enter Play mode
4. Press on the cube on the button or on the top, observe as the cube changes color
5. Build for iOS device
6. Open the build through Xcode
7. Press on the bottom cube it changes color, pressing on the top cube nothing happens

Expected result: cube changes color when pressing either the top one or the bottom one
Actual result: the view that has a camera with MaxRayInteractions set to 1 or more does nothing when the cube is pressed

Reproduced on:
2017.4.0f1 2017.4.11f1 2018.2.8f1 2018.3.0b1

Device reproduced on:
iPhone 7 Plus iOS 11.1.1
Xiaomi Mi Note Pro, Adreno 430 GPU, OS 7.0 with IL2CPP, doesn't reproduce on Mono

Doesn't reproduce on:
Mac OS 10.13.5
Windows 10 machine