dotnet build raise error MSB4062: The "Microsoft.CodeAnalysis.BuildTasks.Csc" task could not be loaded from the assembly

[moh-hassan]

Environment
vs2019 v16.4.0 is installed
last netcore 3.1.100 is installed.
Console project.csproj SDK style , net461
reference a class library project netstandard2.0, net461
The class library reference the package: Microsoft.Net.Compilers.Toolset v 3.4.0 to support c# 8 nullable in VS2017 .

Building the project using vs2019 IDE success.
Building the project using msbuild command success.: msbuild /t:build
Building the project using dotnet build fail with the error

error MSB4062: The "Microsoft.CodeAnalysis.BuildTasks.Csc" task could not be loaded from the assembly C:\Program Files\dotnet\sdk\3.1.100\Roslyn\Microsoft.Build.Tasks.CodeAnalysis.dll. Assembly with same name is already loaded Confirm that the declaration is correct,that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask. [F:\experiment\test.csproj]

Removing the package "Microsoft.Net.Compilers.Toolset and run dotnet build success.

How to stop this error in dotnet build?

[danmoseley]

Hello @moh-hassan I think this probably should go to https://github.com/dotnet/roslyn. Can you close and reopen there?

[moh-hassan]

Thanks @danmosemsft for reply.
Moving the question to roslyn project