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Exception when leaving SfPdfViewer on iOS

Hi,

After updating Xamarin.Forms to 5.0.0.2196 we get this app crash when backing out of an SfPdfViewer page:

Objective-C exception thrown.  Name: NSRangeException Reason: 
Cannot remove an observer Syncfusion_SfPdfViewer_XForms_iOS_CustomPageRenderer 0x7f945ce35ed0 for the key path "sublayers" from CALayer 0x60000556cce because it is not registered as an observer.
Native stack trace:
0   CoreFoundation                      0x00007fff203fbbb4 __exceptionPreprocess + 242
1   libobjc.A.dylib                     0x00007fff2019ebe7 objc_exception_throw + 48
2   Foundation                          0x00007fff207a7062 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 689
3   Foundation                          0x00007fff207a74c2 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 129
4   MyApp.iOS                    0x000000010381a449 xamarin_dyn_objc_msgSend + 217
5   ???                                 0x000000010c45ab4e 0x0 + 4500859726

This does not happen on Xamarin.Forms 5.0.0.2125. Earlier versions (e.g. 19.2.0.59) of SfPdfViewer show the same crash, so I think it's the XF update the triggered the issue.

Kind regards,
Paul