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Created attachment 25169 [details]
When I use a NavigationPage as MainPage and try to push another page, then the page is not displayed. But if I know where navigation elements are, I can still tap them and the tap handler is executed.
The sample app displays only a ListView with 5 elements. On tapping of any of the elements, a new page is pushed. Every page displays a new Title. I do see the first page with the ListView when I start the app on the Mac, but when I tap any element, the next page is not shown. The Title is changed accordingly, but the content of the page is white. I can still tap somewhere on the next list elements and it proceeds to the next page. Through the changes of the Title I see that the navigation still does something, but the page remains empty. When I go back to the first page, then I do see that page again.
This works as expected on UWP and iOS. I also left the Android project in. It should work there too, but I didn't test it.
I used XF 188.8.131.522.
The problem seems to be related to the Xamarin.Mac version.
When I filed this bug, I was using VS for Mac (Preview) 7.2 build 634 and Xamarin.Mac 184.108.40.206. Now I updated to VS 7.3 build 692 and Xamarin.Mac 220.127.116.11. I'm on the alpha channel.
In one of my apps it works now - without changing anything in the source/dependencies. But the attached repro app still doesn't work.