To reproduce:
1. Open 2 any Unity projects in the split screen mode on Android;
2. Resize the split screen;
3. Rotate the device to the horizontal position and back.

Expected result: Aspect ratio should remain the same after rotating the device or resizing the split screen;
Actual result: Aspect ratio breaks after rotating the device or resizing the split screen.

Reproduced with: 2019.1.6f1, 2019.2.0b6, 2019.3.0a3, 2019.3.0a5.

Devices under testing:
Reproduced with
VLNQA00149, SAMSUNG SM-G960F, Exynos 9 Series 9810, Mali-G72, 9.0.0
VLNQA00219, SAMSUNG SM-N960U, Snapdragon 845 SDM845, Adreno (TM) 630, 8.1.0
VLNQA00150, SAMSUNG SM-G960U, Snapdragon 845 SDM845, Adreno (TM) 630, 8.0.0
VLNQA00263, GOOGLE Pixel 3, Snapdragon 845, Adreno (TM) 630, 9.0.0
VLNQA00276, Asus ROG Phone, Snapdragon 845, Adreno (TM) 630, 8.1.0
VLNQA00271, SAMSUNG SM-F900F, Snapdragon 855, Adreno (TM) 640, 9.0.0 (foldable device).