How to reproduce:
1. Open the attached "Repro1270381.zip" Project
2. Make sure that ARMv7 and ARM64 are selected in Project Settings > Player > Android
3. Build and run the app on the phone that supports ARM64

Expected Behavior: "True" is visible on the screen indicating that Incremental GC is enabled
Actual Behavior: "False" is presented on the screen indicating Incremental GC is disabled

Reproducible with: 2019.4.9f1, 2020.1.5f1, 2020.2.0a18

Fixed in: 2020.2.0a19

Could not test with: 2018.4 as it does not have isIncremental property

Devices reproduced(supports ARM64 and ARMv7):
VLNQA00015, Samsung Galaxy Note8 (SM-N950W), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00286, Meizu - (PRO 5), Android 7.0, CPU: Exynos 7 Octa 7420, GPU: Mali-T760

Devices not reproduced(supports only ARMv7):
VLNQA00285, Samsung Galaxy J4 Core (SM-J410F), Android 8.1.0, CPU: Snapdragon 425 MSM8917, GPU: Adreno (TM) 308

Note: The issue is fixed in 2020.2 stream. The issue is only reproducible when Both ARMv7 and ARM64 are selected.