Nesting not working in VS 2019 16.3.1 or Preview 16.4.0 preview 1

[daddyqbob50]

Installed product versions

• Visual Studio: 16.3.1 and 16.4.0 Preview 1
• This extension: [example 1.1.21]

Description

Just does not work. When I try to nest files that were previously nested nothing happens.

Steps to recreate

Create a partial class called MyClass.cs Class name MyClass
Create a second partial class called MyClass.Ext.cs class name MyClass.
(These used to nest automatically. No longer.)
Select the "Ext" class, right click in solution explorer, select "File Nesting" submenu, click "Nest".
Box appears suggesting the file to nest to, in this case "MyClass.cs".
Click "OK".
Nothing happens. Files remain unnested.

Current behavior

Attempts to nest files fail.

Expected behavior

Update needs to be released.

[tom-englert]

Probably related to this: dotnet/project-system#1870

[stefanrbk]

I'm experiencing the same issue with VS 16.8.4 Community Edition with my C# .NET 5 Solution. Nesting not working under any of the projects (all are .NET 5 library projects).