How to reproduce:
1. Open attached Unity project
2. Load "Bugreport#2" scene
3. Select [Scene settings with GI] -> Ray tracing and Post Process Volume in the Hierarchy window
4. Press "Add Override" in the Inspector window
5. Select Ray Tracing -> Recursive Rendering
6. Reload Editor

Expected result: Recursive Rendering is still added after reloading Editor.
Actual result: Recursive Rendering disappears after reloading Editor.

Reproduced with: 2019.3.0b5, 2020.1.0a6

Note: Can't test on other versions because of errors.