To reproduce:
1. Open user's attached project
2. Build it for iOS and run on the device
3.
A. If the text turns green you'll see Font.GetOSInstalledFontNames is called immediately and Unity returns the expected list of fonts.
B. If the text turns red you'll see Font.GetOSInstalledFontNames is called after a short delay and Unity returns an incorrect list of fonts, which only has one entry.
4. If the text won't turn red (reproduce the bug) - kill the application and open again

Expected behavior: Font.GetOSInstalledFontNames shouldn't depend on the time when it's called

Reproduced with: Unity 2017.1.3p2, 2017.2.2p2, 2017.3.2f, 2018.1.0b12, 2018.2.0a6
Device: iPhone 8 iOS 11.0

Not reproducible with: Samsung Galaxy Note 8