Scripting Define Symbols are deleted after applying changes when External Script Editor is set to "Open by file extension"

Reproduction steps:
1. Open the user's attached "Unity 2022.zip" project
2. Go to Edit > Project Settings > Player > (select any platform except Windows, Mac, Linux) > Script Compilation > Script Define Symbols
3. Press the "Add to the list" button
4. Write a name for a Scripting Define Symbol and press the "Apply" button

Expected result: Scripting define Symbol is saved
Actual result: Scripting define Symbol is deleted

Reproducible with: 2022.1.0a2, 2022.1.0f1, 2022.2.0a11
Not reproducible with: 2019.4.38f1, 2020.3.33f1, 2021.3.1f1, 2022.1.0a1

Notes:

• Setting External Script Editor to Visual Studio or Rider and restarting the project fixes the issue (may need to repeat a couple of times)
• Scripting Define Symbols aren't deleted in "Settings for Windows, Mac, Linux"
• Scripting Define Symbols created in "Settings for Windows, Mac, Linux" are also transferred to other platforms