To reproduce:
1. Open users attached project "SkiThree_UnityProj.zip"
2. Build for iOS
3. Run the build with Xcode to A10 device
4. Observe as the skier collides with objects that are not there

Notes: the project is looping. It might not happen the first time, just wait for a couple of cycles of the game and there should be a collision with an object that is not there.
built from iMac macOS High Sierra 10.13.3

Expected result: skier does not collide
Actual result: skier collides with objects that are not there

Reproduced on:
2017.2.0b7, 2017.2.1f1, 2017.3.1p3
Not reproduced on:
2017.1.3p1, 2017.2.0b1, 2017.2.0b6

Reproduces one these devices:

iPhone SE iOS 9.3 A9
iPhone 7 11.0.2 A10
iPhone 7 Plus 11.1.1 A10
iPhone 7 Plus 10.3.2 A10

No repro:

iPhone 8 11.0 A11
iPad Pro 10.5” iOS 10.3.3 A10X

Could not repro on 2018.* since some functions are obsolete.