Custom .net core 7 REST API and AdditionalProperties=False. Why am I not seeing any service objects in my Service Instance!?

I have been testing an issue with a REST service and came across something that I will post here in case anyone else runs into the issue.

I was using .NET Core 7.0 to create a Web API  that exposes Swagger 2.0  via Swashbuckle and found that no service objects were being created for the Models. I tracked this down to an attribute AdditionalProperties = false being added to the end of the definitions section of the Swagger file. Not sure when this became a thing "if anyone else has seen this keen to hear" as I have not had to worry about this in the past. The code that I added was the following middleware: Add a new class:

public class AdditionalPropertiesSchemaFilter : ISchemaFilter
{
    /// <summary>
    /// Middleware to allow for additional properties to be true, else no Service Objects will be created by the REST Broker.
    /// </summary>
    /// <param name="schema"></param>
    /// <param name="context"></param>
    public void Apply(OpenApiSchema schema, SchemaFilterContext context)
    {
        if (context.Type.IsClass)
        {
            schema.AdditionalPropertiesAllowed = true;
        }
    }
}

Add the following code to the Program.cs file:

services.AddSwaggerGen(c =>
{
    c.SchemaFilter<AdditionalPropertiesSchemaFilter>();
});

With this code added your Object Types will be created as expected.