Screen.orientation switches to portrait when switching to autorotate while holding the device in portrait orientation even when Portrait and PortraitUpsideDown are set to false

Steps to reproduce:
1. Open the attached project "1338174.zip"
2. Connect Android device
3. Build and run the "LandscapeOnlyScene" Scene
4. Hold the device in portrait position and observe scene rotation

Expected results: scene switches to landscape mode after 2 seconds and stays there
Actual result: scene switches to landscape mode after 2 seconds and back to portrait after 2 more seconds

Reproducible with: 2020.1.0a8, 2020.3.13f1, 2021.1.13f1, 2021.2.0b1
Did not reproduce with: 2018.4.36f1, 2019.4.28f1, 2020.1.0a7

Reproducible devices:
VLNQA00335, Samsung Galaxy S20 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77
VLNQA00317, Vivo V1924A (V1924A), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00294, Oppo Reno Z 中国版 (PCDM10), Android 9, CPU: Mediatek MT6779 Helio P90, GPU: PowerVR Rogue GM9446
VLNQA00313, Huawei Y6 Ⅱ Compact (HUAWEI LYO-L01), Android 5.1, CPU: MediaTek MT6735, GPU: Mali-T720
VLNQA00286, Meizu - (PRO 5), Android 7.0, CPU: Exynos 7 Octa 7420, GPU: Mali-T760

Not reproducible on:
N/A, Samsung Galaxy S10 (SM-G975F), Android 10, CPU: Exynos 9820 (ARMv8), GPU: Mali-G76
N/A, Samsung Galaxy S9 (SM-G960F), Android 8, CPU: Exynos 9810 (ARMv8-A), GPU: Mali-G72
N/A, BlackShark 3 (KLE-H0), Android 10, CPU: Qualcomm Klein (ARM64-v8), GPU: Andreno 650