Xamarin.Forms : CommandParameter no longer working on buttons in a listview (MVVM + Prism)

[chenaimt]

I have a project with various types of pages that contain listviews with labels and buttons inside a data template. The list views have been populating correctly all along untill my last Xamarin.Forms upgrade to version 4.4.0.991477. Now when the pages load the listviews are empty but if you hover over them you see the rows have been created - they are just blank. If i remove the CommandParameter from the buttons that are in the list view, the lists will populate correctly and triggers the command in the ViewModel however no parameter is passed when you click the buttons (obviously coz the CommandParameter has been removed). In addition, if you select the row, the event is triggered correctly with the correct data. i have tried all methods of including the CommandParameter but each of them make the lists populate empty rows. The code has been working all along till the upgrade

Steps to Reproduce

1. Include the CommandParameter binding on a button in a datatemplate (list view). Run the code
2. Include the CommandParameter binding on a button in a datatemplate (list view). Run the code

Expected Behavior

The listviews should populate with all controls including buttons. The buttons should also work accordingly when clicked

Actual Behavior

The listviews are created with empty rows. If you hover over with a mouse you will see the rows that have been created but at first sight it just looks like an empty page

Basic Information

The code has been working till the update

• Version with issue: 4.4.0.991477
• Last known good version: Most likey 4.1.0.618606
• IDE: Visual Studio 2019
• Platform Target Frameworks: .Net Standard 2.0
  • iOS: NA
  • Android: NA
  • UWP: Windows 10 version 1809, Build 17763
• Android Support Library Version: NA
• Nuget Packages: Many including Sqlite, Prism, XamarinForms, .Net, Flurl, etc
• Affected Devices: All

Screenshots

Reproduction Link

Workaround

I am going to try to roll back Xamarin.Forms

[chenaimt]

Rolled back my Xamarin.Forms and my listviews now display the data correctly

[StephaneDelcroix]

could you please provide a reproduction project ? thanks

[PureWeen]

This is a duplicate of
#8918

It's interesting because if you just use our command and not prisms everything works fine but it's definitely a regression