David
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                                            David
                                        
                                    Same for me, even in Debug on a real device with Android 9. v4.8.0.1451 Killing the app makes it work as expected too.
FYI: Having placed the Flexlayout inside a Stacklayout which is placed inside two nested Grids triggers a NullReferenceException in LayoutSubviews().. Removing the uppermost Grid resolves this.