How to reproduce:
1. Open the project provided in the link in the Edit section
2. Open the Sample scene in the Project window/Scenes
3. Enter the Play Mode, press the Relode button and inspect the animation
4. Build for iOS and deploy the Xcode project to the iOS device
5. Press the Relode button and inspect the animation

Expected: Animation is reloaded and played again
Actual: Character resets to its original pose and stops animating

Reproducible with: 2019.2.19f1, 2019.3.0f6, 2020.1.0a21

Reproducible with:
iPhone 7 (iOS 11.0)
iPhone XR (iOS 13.2.3)

Note: Could not test on earlier versions or Android because of the thrown errors