Steps to reproduce:
1. Create a new project
2. Navigate to Edit > Project Settings... > Player > Other Settings > Script Compilation
3. Add an element to the Scripting Define Symbols list, but do not click the “Apply” button
4. Observe the Scripting Define Symbols list on other platforms

Expected result: Scripting Define Symbols list is only affected on the platform it was modified on
Actual result: Scripting Define Symbols list becomes the same on all platforms

Reproducible with: 2020.3.40f1, 2021.3.11f1, 2022.1.14f1
Not reproducible with: 2022.1.15f1, 2022.1.18f1, 2022.2.0b9, 2023.1.0a12

Notes:
- If there are pre-existing elements that have been applied, these get overwritten as well.
- Applying the changes to the list makes the values of other platform lists return to their previous states
- Likely related to UUM-3083, as it is fixed in the same version