Reproduction steps:
1. Open the attached project “CS8032_Warning”
2. Open Edit > Preferences > External Tools
3. Set External Script Editor to Microsoft Visual Studio 2022
4. In the Project window create a new C# Script
5. Open the newly created script
6. Observe the Error List

Expected result: There are no warnings
Actual result: Multiple CS8032 warnings are printed

Reproducible with: 2023.2.0a9, 2023.2.0a22
Not reproducible with: 2021.3.28f1, 2022.3.4f1, 2023.1.3f1, 2023.2.0a8

Reproducible on: Windows 10

Notes:
Warnings do not appear when using Rider or older Visual Studio versions
It might take a couple of seconds for Warnings to appear
Reproducible with newly created projects