Reproduction steps:
1. Open the attached project.
2. Open the "SampleScene" scene and play it.
3. Press the "Serialize" button.
4. Notice, that 4 lines are printed.
5. Build and run the project to iOS.
6. Press the "Serialize" button.

Actual behavior:
- 5 lines are printed ("AnalyticsEventType" is added).

Expected behavior:
- 4 lines are printed.

Reproduced with:
iOS
2018.1.9f1, 2018.2.2f1, 2018.3.0a8

Notes:
- The project doesn't work on older Unity versions.
- Other IL2CPP (not iOS) platforms don't print any lines.