T4 Template Could not load file or assembly 'System.Runtime, Version = 4.2.0.0'

Question

So I have a T4 Template I'm trying to run at design-time, but it keeps giving me the following error.

Running transformation: System.IO.FileNotFoundException: Could not load 
file or assembly 'System.Runtime, Version=4.2.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system 
cannot find the file specified.
File name: 'System.Runtime, Version=4.2.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a'

My Visual Studios solution has 10 projects contained within it, all of which target .Net Core 2.0 framework. My T4 template presently looks as such:

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Reflection" #>
<#@ import namespace="Services.Resources.DataTransferObjects.Infrastructures" #>
<#@ import namespace="System.Collections.Generic" #> 
<#@ assembly name="$(TargetDir)Services.dll" #>


<#@ output extension=".cs" #>
public class AdminDTO
{
        <#var editableObjs = Assembly
            .GetAssembly(typeof(GenericEditable<>))
            .GetTypes()
            .Where(p => p.BaseType != null && p.BaseType.IsGenericType && p.BaseType.GetGenericTypeDefinition() == (typeof(GenericEditable<>)))
            .ToList();
        #>
}

At the moment I only need the assembly I've referenced in the template, which is a .Net Core 2.0 class library project. I've tried adding the System.Runtime.dll reference in this particular library, but it doesn't appear to make any difference.

I've read several other issues similar to this, and it generally seems that .Net Core seems to have issues with T4 Templates, but it appeared most peoples' solutions were to target a .Net Standard library. I'm not sure this is applicable for me, as my entire solution only involves .Net Core projects.

EDIT

I changed all my projects to target .Net Standard 2.0 instead of .Net Core, and that fixed my initial problem, but now I see this error:

System.Reflection.ReflectionTypeLoadException: Unable to load one or 
more of the requested types. Retrieve the LoaderExceptions property for 
more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeModule.GetTypes()
at System.Reflection.Assembly.GetTypes()

Answer 1

I found a workaround for the System.Runtime dll error.

Put this bindingRedirect inside the C:\Users\<user>\AppData\Local\Microsoft\VisualStudio\15.0_29f8d23a\devenv.exe.config inside <configuration> -> <runtime> -> <assemblyBinding> where are all the others bindingRedirect's

<dependentAssembly>
  <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
  <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="4.0.0.0"/>
</dependentAssembly>

It's a bug in Visual Studio or T4 Template Engine: https://developercommunity.visualstudio.com/content/problem/358905/filenotfoundexception-systemruntime-version4210-wh.html