Reproduction steps:
1. Open the attached project.
2. Build it to a device (iOS preferably).
3. Swap between 'Portrait' and 'PortraitUpsideDown' orientation up to 20 times.

Actual behavior:
- 5-50% of the time screen redraws itself in an opposite orientation for a few frames when screen is rotated. It looks like a flicker.

Expected behavior:
- Constant behavior on every screen rotation.

Reproduced with:
- 2017.2.2p2, 2017.3.2f1, 2018.1.0b12, 2018.2.0a6
- iPhone 7 iOS 11.0.2, iPod Touch 6th gen iOS 10.2.1

Note:
- It may be an iOS only issue. It reproduces 100% of the time on Android devices, but instead of flicker, you can see a brief shadow of a text in the yellow area of the screen. It is more difficult to notice this issue using Android as rotation animation is played when a device is rotated.
(Google Pixel 2*, OS:8.0.0, CPU:arm64-v8a, GPU:Adreno (TM) 540, Build:google/walleye/walleye:8.0.0/OPD1.170816.010/4311506:user/release-keys)