Steps to reproduce:
1. Open user's attached project "case_1227315"
2. Navigate to Build settings
3. Export the project
4. Navigate to Project directory-> Assets-> "baseProjectTemplate.gradle" and open it with Text editor
5. Notice Custom settings at lines 6, 13, 16,
5. Navigate to Exported projects location ->"build.gradle" and open it with a text editor
7. Notice that Custom settings are not present

Expected results: Custom Gradle settings are exported
Actual results: Custom Gradle settings are not exported

Reproducible with: 2017.4.39f1, 2018.4.20f1, 2019.3.8f1, 2020.1.0b4, 2020.2.0a5