Reproduction steps:
1. Open attached project "ReproProject"
2. Open "SampleScene" Scene in the Scenes folder
3. Open Console Window
4. Turn off the stack trace by navigating to triple dots near Console Window -> Stack Trace Logging -> All -> None
5. Enter and Exit Play Mode
6. Double-click on the "Double click this with StackTrace enabled and disabled" Log
7. Open the project in the File Explorer
8. Open the "ReproProject.sln" file with Notepad

Expected result: The first line in "ReproProject.sln" is Microsoft Visual Studio Solution File, Format Version 12.00
Actual result: The first line in "ReproProject.sln" is Microsoft Visual Studio Solution File, Format Version 11.00

Reproducible with: 2.0.12 (2019.4.35f1, 2020.3.27f1, 2021.1.0a4)
Not reproducible with: 2.0.12 (2021.1.0a5, 2021.1.28f1, 2021.2.9f1, 2022.1.0b5, 2022.2.0a2)