This bug is also reported but as a comment. As we really need it resolved in your next release, I am posting it in a separate new thread as it is a different crash location.
Xamarin.Form UWP apps, SfPdfViewer crashes. Following is the error information and Stack Trace.
Value does not fall within the expected range.
at Windows.Data.Pdf.PdfDocument.GetPage(UInt32 pageIndex)
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c.<ThrowAsync>b__7_0(Object state)