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Created attachment 14548 [details]
Finally reproduced this crazy bug. If you have a ToolbarItem and then navigate to a TabbedPage, it will throw an Object not set to an instance of an object error.
If you navigate to a regular ContentPage or remove the ToolbarItem, then no error is thrown.
Just to note, the ToolbarItem isn't actually causing the navigation, its any navigation from any VisualElement to the TabbedPage.
I tested with previous versions of Forms and this seems to be a regression introduced in 188.8.131.5277-pre2.
Any sign of a fix yet?
Fix has been submitted and should be included in an upcoming release.