Repro steps:
1. Open attached project
2. Build and Run on Android
3. Press the back button
4. If the app doesn't crash try to resume it

Actual: App crashes

Reproducible with: 2018.4.20f1
Not reproducible with: 2018.4.19f1, 2019.1.14f1, 2019.2.21f1, 2019.3.9f1, 2020.1.0b4, 2020.2.0a5

Tested and reproduced on these devices:
VLNQA00260, Oculus (Pacific), Android 7.1.1, CPU: Snapdragon 820E Embedded, GPU: Adreno (TM) 530
VLNQA00294, Oppo Reno Z (PCDM10), Android 9, CPU: Mediatek MT6779 Helio P90, GPU: PowerVR Rogue GM9446
VLNQA00128, Samsung Galaxy Note8 (SM-N950F), Android 9, CPU: Exynos 9 Octa 8895, GPU: Mali-G71

Didn't reproduce on:
VLNQA00275, Oculus (Quest), Android 7.1.1, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00013, Samsung Galaxy S6 edge+ (SM-G928F), Android 7.0, CPU: Exynos 7 Octa 7420, GPU: Mali-T760
VLNQA00317, Vivo V1924A (V1924A), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00078, Motorola Nexus 6 (Nexus 6), Android 7.1.1, CPU: Snapdragon 805 APQ8084AB, GPU: Adreno (TM) 420

Notes:
- Doesn't crash on Mono