Derived type's properties missing in JSON response from ASP.NET Core API

Question

The JSON response from my ASP.NET Core 3.1 API controller is missing properties. This happens when a property uses a derived type; any properties defined in the derived type but

Answer 1

I solved it by writing this extension:

public static class JsonSerializationExtensions
{
    public static string ToJson(this IEnumerable enumerable, bool includeDerivedTypesProperties = true)
            where T : class
    {
        var jsonOptions = new JsonSerializerOptions()
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
        };

        if (includeDerivedTypeProperties)
        {
            var collection = enumerable.Select(e => e as object).ToList();
            return JsonSerializer.Serialize