C# System.Text.Json.Deserialize<GProject>() wont use [JsonConstructor]

I have a class like this.

    public class GProject : Project
        public GProject()


        public GProject(ISaveRow value, List<ISaveList> lists, List<ISaveGroup> groups)


When I use System.Text.Json.Deserialize(MyJson) I want to use specific constructor with attribute [JsonConstructor]. From my google search,[JsonConstructor] should allways be called when I use System.Text.Json.Deserialize, but its not and the very first constructor to be used is still GProject() {} - I doesnt want that.

...For a struct, or a class with multiple constructors, specify the one to use by applying the [JsonConstructor] attribute. ...

Can you give me some tips on how to resolve this problem?

Read more here: https://stackoverflow.com/questions/68484796/c-sharp-system-text-json-deserializegproject-wont-use-jsonconstructor

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