Output before updating the svc-util:

Microsoft (R) WCF Service Model Proxy Generation Tool for .Net Core platform
[Microsoft.Tools.ServiceModel.Svcutil, Version 2.0.1]
Copyright (c) Microsoft Corporation.  All rights reserved.

This tool collects information about how it is used in order to improve the tool. This functionality can be disabled by setting the environment variable "DOTNET_SVCUTIL_TELEMETRY_OPTOUT" to 1.

Resolving project references ...
Bootstrapping application ...
Error: Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

C:\Program Files\dotnet\sdk\6.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [C:\Users\myself\AppData\Local\Temp\dotnet-svcutil-lib_Temp\2021_Nov_12_14_32_32\SvcutilBootstrapper\SvcutilBootstrapper.csproj]
CSC : error CS8630: Invalid 'nullable' value: 'Enable' for C# 7.3. Please use language version '8.0' or greater. [C:\Users\myself\AppData\Local\Temp\dotnet-svcutil-lib_Temp\2021_Nov_12_14_32_32\SvcutilBootstrapper\SvcutilBootstrapper.csproj]

Build FAILED.

C:\Program Files\dotnet\sdk\6.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [C:\Users\myself\AppData\Local\Temp\dotnet-svcutil-lib_Temp\2021_Nov_12_14_32_32\SvcutilBootstrapper\SvcutilBootstrapper.csproj]
CSC : error CS8630: Invalid 'nullable' value: 'Enable' for C# 7.3. Please use language version '8.0' or greater. [C:\Users\myself\AppData\Local\Temp\dotnet-svcutil-lib_Temp\2021_Nov_12_14_32_32\SvcutilBootstrapper\SvcutilBootstrapper.csproj]
    1 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.58
An error occurred while bootstrapping svcutil. This usually happens when processing references.  You might be able to work around this problem by not providing reference parameters, and manually removing any types redefined in the generated proxy code.

If you would like more help, type "dotnet-svcutil -h"

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <AssemblyVersionFile>$(IntermediateOutputPath)\$(TargetFramework)\$(MSBuildProjectName).$(TargetFramework).version.cs</AssemblyVersionFile>
  </PropertyGroup>
  
  <!--Package Properties-->
  <PropertyGroup>
    <IsPackable>true</IsPackable>
    <IsShipping>$(Ship_SvcUtilPackages)</IsShipping>
    <MajorVersion>2</MajorVersion>
    <MinorVersion>0</MinorVersion>
    <PatchVersion>4</PatchVersion>
    <PreReleaseVersionLabel>preview1</PreReleaseVersionLabel>
    <DotNetUseShippingVersions>true</DotNetUseShippingVersions>
    <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
    <NoDefaultExcludes>true</NoDefaultExcludes>
    <EnableXlfLocalization>true</EnableXlfLocalization>
  </PropertyGroup>

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>netcoreapp2.1;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
    <RootNamespace>Microsoft.Tools.ServiceModel.Svcutil</RootNamespace>

    <PackAsTool>true</PackAsTool>
    <ToolCommandName>dotnet-svcutil</ToolCommandName>
    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
  </PropertyGroup>


  <ItemGroup>
    <ProjectReference Include="..\lib\src\dotnet-svcutil-lib.csproj" />
  </ItemGroup>
</Project>