MSBuildTreatWarningsAsErrors doesn't work in Visual Studio builds

In Visual Studio, I can add the property MSBuildTreatWarningsAsErrors and set it to true:

```

Exe
net6.0
enable
enable
true

```

I notice that in a build, the output text changes from “warning CS0168” to “error CS0168”:

```
1>C:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\Program.cs(3,5,3,6): error CS0168: The variable 'i' is declared but never used
1>ConsoleApp4 -> C:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\bin\Debug\net6.0\ConsoleApp4.dll
1>Done building project "ConsoleApp4.csproj".
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
```

However, the build is not failed. It is still marked as succeeded. Shouldn’t the build have failed? Is there another property or command-line switch to set to fail the build.

From the command line, the same build FAILS.

```
msbuild ConsoleApp4.csproj

Done Building Project "c:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\ConsoleApp4.csproj" (default targets).

Build FAILED.

"c:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\ConsoleApp4.csproj" (default target) (1) ->
(CoreCompile target) ->
c:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\Program.cs(3,5): error CS0168: The variable 'i' is declared but
never used [c:\Users\ghogen\source\repos\ConsoleApp4\ConsoleApp4\ConsoleApp4.csproj]

0 Warning(s)
1 Error(s)
```

VS should have the same result as the command-line build of the same project.