NSwag: Nswag studio: assembly specified YamlDotNet.Signed not found

Trying to use the ASP.NET Core via API Explorer functionality in NSwagStudio v12.0 and I get the following exception:

I can get the TypeScript to generate when using the Swagger Specification option. Not sure why I cannot use the API Explorer option.

In ConfigureServices I have added AddSwaggerDocument() after AddMvc() as well as set the compatibility version.

In Configure I have this after UseMvc:

    // Add OpenAPI/Swagger middlewares
            app.UseSwagger(); // Serves the registered OpenAPI/Swagger documents by default on `/swagger/{documentName}/swagger.json`
            app.UseSwaggerUi3(); // Serves the Swagger UI 3 web ui to view the OpenAPI/Swagger documents by default on `/swagger`