Another strange one. Using build 3108, if I run the App in the simulator the main is called once. If I compile it and run the Windows EXE the main is called twice! Causing some issues to be honest as the app is loading the first page twice…
You can recreate it by creating an empty project with a main file with a simple PRINT statement. Compile it for Windows and run it through the simulator and you will see the print statement twice!