Xamarin.Forms: Unwanted Behavior of Master-Detail Menu/Hamburger button - xamarin

I'm running the default Master Detail app for Xamarin.Forms which shows the Menu/Master button on the top left.
And this is how it looks when I rotate it to landscape.
When I drill down into detail page while in Landscape...
Then I rotate the device to portrait mode on this page.
Everything is working as expected until I press back button from this page.
You might see it is missing the Master/menu button(or the hamburger button). Am I missing anything here?
SCREEN RECORDING

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