How to reproduce:
1. Launch the user-supplied project on Unity
2. Build the project for iOS
3. Launch the build on an iOS device through Xcode
4. Watch the device's screen

Expected result: all images on the screen turn green and say "Hello World!"
Actual result: only one image turns green and the rest are prevented from completion

Reproducible with: 2019.2.17f1, 2019.2.19f1, 2019.3.0b5, 2019.3.0f5
Not reproducible with: 2019.2.4f1, 2019.3.0b4, 2020.1.0a1
Could not test with: 2017.4.36f1, 2018.4.15f1, 2019.2.5f1, 2019.2.16f1

Notes:
1. I was not able to test on versions 2019.2.5f1 through 2019.2.16f1 due to another iOS bug featuring a pink device screen
2. Only reproduced in 2019.2-2019.2.19f1 and 2019.3.0b5-2019.3.0f5. Not reproducible in the entire 2020.1 stream
3. Could not test on 2018.4 and 2017.4 due to errors

Reproduced on:
iPhone 8 iOS 11.0
iPad (7th generation) iOS 13.2.2