Intellisense is not working for vscode

[Anipik]

The new config system broke the intellisense for vscode. This could be verified from the omnisharp log

[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'd:\runtime\src\libraries\System.IO.FileSystem.AccessControl' on host 6192.
[fail]: OmniSharp.MSBuild.ProjectLoader
        The TargetFramework value 'netcoreapp5.0-Windows_NT' was not recognized. It may be misspelled. If not, then the TargetFrameworkIdentifier and/or TargetFrameworkVersion properties must be specified explicitly.
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'd:\runtime\src\libraries\System.IO.FileSystem.AccessControl\tests\System.IO.FileSystem.AccessControl.Tests.csproj'.
d:\runtime\src\libraries\System.IO.FileSystem.AccessControl\tests\System.IO.FileSystem.AccessControl.Tests.csproj
C:\Program Files\dotnet\sdk\3.1.200-preview-014971\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets(93,5): Error: The TargetFramework value 'netcoreapp5.0-Windows_NT' was not recognized. It may be misspelled. If not, then the TargetFrameworkIdentifier and/or TargetFrameworkVersion properties must be specified explicitly.

[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: d:\runtime\src\libraries\System.IO.FileSystem.AccessControl\src\System.IO.FileSystem.AccessControl.csproj
[fail]: OmniSharp.MSBuild.ProjectLoader
        The TargetFramework value 'netcoreapp5.0-Windows_NT' was not recognized. It may be misspelled. If not, then the TargetFrameworkIdentifier and/or TargetFrameworkVersion properties must be specified explicitly.
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'd:\runtime\src\libraries\System.IO.FileSystem.AccessControl\src\System.IO.FileSystem.AccessControl.csproj'.
d:\runtime\src\libraries\System.IO.FileSystem.AccessControl\src\System.IO.FileSystem.AccessControl.csproj
C:\Program Files\dotnet\sdk\3.1.200-preview-014971\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets(93,5): Error: The TargetFramework value 'netcoreapp5.0-Windows_NT' was not recognized. It may be misspelled. If not, then the TargetFrameworkIdentifier and/or TargetFrameworkVersion properties must be specified explicitly.

[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: d:\runtime\src\libraries\System.IO.FileSystem.AccessControl\ref\System.IO.FileSystem.AccessControl.csproj
[fail]: OmniSharp.MSBuild.ProjectLoader
        The "ChooseBestP2PTargetFrameworkTask" task was not given a value for the required parameter "TargetFramework".
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'd:\runtime\src\libraries\System.IO.FileSystem.AccessControl\ref\System.IO.FileSystem.AccessControl.csproj'.
d:\runtime\src\libraries\System.IO.FileSystem.AccessControl\ref\System.IO.FileSystem.AccessControl.csproj
C:\Users\calope\.nuget\packages\microsoft.dotnet.build.tasks.targetframework.sdk\5.0.0-beta.20124.3\build\Microsoft.DotNet.Build.Tasks.TargetFramework.Sdk.targets(76,5): Error: The "ChooseBestP2PTargetFrameworkTask" task was not given a value for the required parameter "TargetFramework".

cc @ericstj @ViktorHofer @safern @danmosemsft @carlossanlop @danmosemsft

[ericstj]

Do we know what's wrong and how to fix it? It looks like Omnisharp isn't evaluating the project to strip the TargetFramework value.

[ericstj]

I believe this should be a dup of #33427.