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Please see the code in the gist below:
When you click the button labelled "Click to open red page as modal" - it will open red page as modal but the background color is default (black). It's disregarding the "Red" as background color from App.xaml resource dictionary.
When you click the button labelled "Click to open red page as normal" - it will add red page to the current navigation stack and it has the correct background color ("Red" as defined in the App.xaml resource dictionary)
I can confirm this happens in both UWP and WinPhone 8.1 projects.
Created attachment 19541 [details]
Added a sample project using the code linked in comment #1.
I've updated the status to NEEDINFO because I can't reproduce the issue with the code given (used in the attached sample) when I updated to Xamarin.Forms 18.104.22.168-pre1.
Please let me know if you no longer experience the same issue with this newest version and we can close this bug report.
Possible duplicate of bug 42447
Because we have not received a reply to our request for more information we are closing this issue. If you are still encountering this issue, please reopen the ticket with the requested information. Thanks!