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after a PushAsync throws Unhandled Exception:\r\nSystem.InvalidOperationException: Collection was modified; enumeration operation may not execute. occurred\r\n\r\nRun the attached program.  It will present a list of 'Announcements'.  \r\n1. Tap one of the items to open a second page\r\n2. press the back button to return to the previous page\r\n3. exception is thrown\r\n\r\nPage will pop without exception\r\n\r\nException is thrown\r\n\r\n- Version with issue:  2.5.1.444934\r\n- Last known good version:  2.5.0.122203\r\n- IDE: VS2017\r\n- Platform Target Frameworks: \r\n  - Android: 8.1\r\n- Android Support Library Version: 27.0.2\r\n- Nuget Packages:\r\n- Affected Devices:\r\n\r\n<!-- Please upload or provide a link to a reproduction case -->\r\n[PopException.zip](https://github.com/xamarin/Xamarin.Forms/files/1965013/PopException.zip)\r\n\r\n\r\n"}}
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