Description

Crash after updating to 3.3 Stable. In Forms + Mac, changing Applications Main Page crashes. Working in 3.2

Steps to Reproduce

Steps for regression crash

1. Create a new Project with Forms 3.2 + iOS (Android not required now)
2. Add a MacOS cocoa project with Forms 3.2 dependency. Set this as default project.
3. Make necessary changes in macOS files and ensure the MainPage is visible.
4. Add a new SecondPage.XAML
5. In App.xaml.cs, change the app's MainPage to SecondPage.XAML (just to verify its working)
6. To the SecondPage add a button 'Click Me'. In the button handler add the following code
   var myApp = (App)Xamarin.Forms.Application.Current;
myApp.MainPage = new MainPage();
7. Run the macOS app, click the button 'Click Me'. Wait for few seconds >>CRASH <<

Expected Behavior

Specified page must be visible and application continues to work.

Actual Behavior

CRASH<<

Basic Information

• Version with issue: 3.3.0.912450
• Last known good version:3.2.0871581
• IDE: Visual Studio for Mac
• Platform Target Frameworks:
  • macOS: 10.11
• Nuget Packages: forms 3.3.0.912450
• Affected Devices:

Screenshots

Reproduction Link