Using AutoDual on classes exposes every public method of the class automatically. To avoid that you can use AutoDual interfaces instead and implement it. Something like this should be equivalent:

[InterfaceType(ComInterfaceType.InterfaceIsDual), ComVisible(true)]
public interface IWrapper
{
    string Text1 { get; set; }
    string Text2 { get; set; }
    IClass1 Class1 { get; set; }
    IClass2 Class2 { get; set; }
}

[ClassInterface(ClassInterfaceType.None), ComVisible(true)]
[ProgId("InteropTest.Wrapper")]
public class Wrapper : IWrapper
{
    public string Text1 { get; set; } = "hello";
    public string Text2 { get; set; } = "world";
    public IClass1 Class1 { get; set; } = new Class1();
    public IClass2 Class2 { get; set; } = new Class2();
}

[InterfaceType(ComInterfaceType.InterfaceIsDual), ComVisible(true)]
public interface IClass1
{
    string Method1a(string myText);
    string Method1b(string myText);
}

[ClassInterface(ClassInterfaceType.None), ComVisible(true)]
public class Class1 : IClass1
{
    public string Method1a(string myText) => myText;
    public string Method1b(string myText) => myText;
}

[InterfaceType(ComInterfaceType.InterfaceIsDual), ComVisible(true)]
public interface IClass2
{
    string Method2a(string myText);
    string Method2b(string myText);
}

[ClassInterface(ClassInterfaceType.None), ComVisible(true)]
public class Class2 : IClass2
{
    public string Method2a(string myText) => myText;
    public string Method2b(string myText) => myText;
}

Note .NET fields have been replaced by .NET properties since you cannot define fields in interfaces, but at COM level it shouldn't change anything.