Implicit hide animation causes AccessViolationException + Fail fast exception in Windows.UI.Xaml.dll and MinUser.dll

Hello, I’m having a problem with an exception that is thrown in my app (I know how to reproduce it, fortunately) that I have no idea how to solve. A few info on the problem:

• The same crash happens in the same way both in Debug and Release mode
• When crashing in Debug mode (without .NET Native), VS doesn’t show any kind of error message and the app just closes, and after a few seconds the VS debugger closes too
• When debugging with .NET Native enabled, I manage to get these two info on the exceptions being thrown: AccessViolationException and then (pressing Continue on the debugger) a FailFastException
• ~This issue is possibly related to the RichEditBox control I’m using and it happens when calling the ‘ITextRange.Move(TextRangeUnit, Int32)’ method repeatedly (even though the number of times needed to make the app crash is variable). So, this is possibly related to #223~ It looks like the issue is caused by an implicit composition animation I play whenever I close a popup, removing it works as a workaround for the crash
• None of those exceptions had an available StackTrace in the debugger (could be just because of the .NET Native compiler, I’m not sure)
• The app targets W10 build 10.15063

Anyways, I don’t think this is to be expected and right now I have a section of the app that’s completely broken because of this and I have absolutely no idea on what to do to solve this problem. Any help would be really appreciated, thank you in advance! Sergio

[stmoy]

Hi @Sergio0694 - we made some changes in these code paths as a part of the development for the next version of Windows. Can you please try out the broken scenario using an insider build and let us know if the issue still occurs?

[Sergio0694]

Hey @scott-moore-ms and @stmoy - thank you for your help, sorry for the late reply! I’ve just tried again and I couldn’t replicate the issue, so it looks like that crash is no longer happening in this situation, great work! 😄 (tested on 17736.x with an app targeting 17134)