On-PropName-Changed not called for dependent properties

[cell001nz]

I've avoided upgrading since 3.1.3 due to a behaviour change in 3.2.0 which introduces bugs in my code. It would be good to know if the change was intentional.

With 3.1.3 the code below prints:
Length changed to 3
Name changed to One

If I upgrade to 3.2.0:
Name changed to One

This seems to be because >= 3.2.0 has stopped calling On-PropName-Changed for dependencies. It looks like a property changed event is raised for the dependent property, but not the associated On-Property-Changed method;

static void Main(string[] args)
{
   Thing thing = new Thing();

   thing.Name = "One";
}

[AddINotifyPropertyChangedInterface]
public class Thing
{
   public string Name { get; set; }

   public int Length => Name?.Length ?? 0;

   private void OnNameChanged() => Console.WriteLine($"Name changed to {Name}");
   private void OnLengthChanged() => Console.WriteLine($"Length changed to {Length}");
}

[ltrzesniewski]

Hmm I don't think that was an intentional change...

The build produces the following warning:

Warning : Fody/PropertyChanged: Type ConsoleApp.Thing does not contain a Length property with an injected change notification, and therefore the OnLengthChanged method will not be called. You can suppress this warning with [SuppressPropertyChangedWarnings].

And here's the setter of Name:

[CompilerGenerated]
set
{
    if (string.Equals(this.<Name>k__BackingField, value, StringComparison.Ordinal))
    {
        return;
    }
    this.<Name>k__BackingField = value;
    this.<>OnPropertyChanged(<>PropertyChangedEventArgs.Length);
    this.OnNameChanged();
    this.<>OnPropertyChanged(<>PropertyChangedEventArgs.Name);
}

[cell001nz]

So it sees there is no setter for Length, therefore no possible call to OnLengthChanged(), and incorrectly concludes that a call to OnLengthChanged() shouldn't be generated elsewhere, ie in the Name setter.

I see if I change the Length property to the following, it will work:

public int Length { get => Name?.Length ?? 0; set { } }

[cell001nz]

Looks like it was the following revision which introduced the problem. I'm going to have a look and see if there is anything I can do, but I've not looked at the code before so there's no telling how it will go.

Revision: 65ea5fe
Date: 08/12/2019 22:23:19