Debugging .NET Assembly Load

I am struggling with loading a .NET 8 library assembly into matlab. I keep getting errors like the following:

Could not load file or assembly 'System.Runtime, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

After attempting the load, I check the .NET environment and I get the following:

>> dotnetenv

ans = 

  NETEnvironment with properties:

            Runtime: framework
             Status: loaded
            Version: ".NET Framework 4.0.30319.42000"
    RuntimeLocation: "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\"

Why is it loading the .NET Framework if the assembly is .NET 8? I created a new C#, .NET 8 library in Visual Studio. It has only one class with a couple of properties. The results above are from attempting to load this project.

Since the error occurs during loading, there's nothing for Visual Studio debugger to attach to. Is there a way to debug the assembly loading in Matlab or is this a .NET issue? The only other option I can think of is to start shotgun loading various dependencies trying to find the right sequence to load things, but that will be very painful.

EDIT

I downloaded Fusion++ and been trying to diagnose the way Matlab is attempting to load these assemblies. One thing I've discovered is a difference between a self-contained and framework-dependent build in .NET. When creating a self-contained library the error you get is:

Message: Could not load type 'System.Object' from assembly 'System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' because the parent does not exist.
Source: mscorlib
HelpLink: None

When creating a framework-dependent library it's a slightly different error.

Message: Could not load file or assembly 'System.Runtime, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
Source: mscorlib
HelpLink: None

It seems it can find the .NET 8 runtime in the self-contained build, but fails on some subsequent dependency.

Answer 1

[Michael VanMeter]

The solution, as it turns out, is quite simple. I needed to change the runtime from "framework" to "core" prior to calling addAssembly.

>> dotnetenv("core")

ans = 

  NETEnvironment with properties:

            Runtime: core
             Status: notloaded
            Version: ""
    RuntimeLocation: ""

>> NET.addAssembly(dllPath)

ans = 

  NET.Assembly handle
  Package: NET

Properties for class NET.Assembly:

    AssemblyHandle
    Classes
    Structures
    Enums
    GenericTypes
    Interfaces
    Delegates

[Michael VanMeter]

Thank you pindumb of StackOverflow for this answer.