maybe model inheritance is friends we made along the way...

- moved AnswerVariants to QuestionBase due to strange logic

SurveyLib.Core/Models/QuestionBase.cs

@@ -8,6 +8,8 @@ public class QuestionBase
 
     public string Discriminator { get; set; }
 
+    public ICollection<AnswerVariant>? AnswerVariants { get; set; }
+
     public Survey Survey { get; set; }
     public ICollection<Answer> Answers { get; set; }
 }