### Environment - Pythonnet version: 3.0.0a2 - Python version: 3.8.10 - Operating System: Ubuntu 20.04.4 LTS (docker run --rm -it ubuntu:20.04) - .NET Runtime: .NET Core 6.0.202 ### Details - Describe what you were trying to get done. Attempting to implement interfaces defined in .NET. Works fine for simple interfaces but I receive a weird error when the interface extends IDisposable - What commands did you run to trigger this issue? If you can provide a [Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve) this will help us understand the issue. ```python from clr_loader import get_coreclr rt = get_coreclr("conf.json") from pythonnet import set_runtime set_runtime(rt) import clr import System import System.Buffers class MyDisposable(System.IDisposable): __namespace__ = "MyNamespace" def Dispose(self) -> None: print("Dispose") md = MyDisposable() md.Dispose() class MyBuffer(System.Buffers.IMemoryOwner): __namespace__ = "MyNamespace" def Dispose(self) -> None: print("Dispose") mb = MyBuffer() mb.Dispose() ``` conf.json: ```json { "runtimeOptions": { "tfm": "net6.0", "framework": { "name": "Microsoft.NETCore.App", "version": "6.0.4" } } } ``` - If there was a crash, please include the traceback here. ``` (venv) root@ca20f043eef5:/t# python demo.py Dispose Traceback (most recent call last): File "demo.py", line 21, in <module> class MyBuffer(System.Buffers.IMemoryOwner): TypeError: Method 'Dispose' in type 'MyNamespace.MyBuffer' from assembly 'Python.Runtime.Dynamic, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation. ```