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I currently tested the AppCompat using a Toolbar with the DrawerLayout.
We use a black back button on a white toolbar.
This works fine on >= Lollipop.
But on < API21 I noticed a strange behaviour:
1) Open the app (hamburger is shown)
2) Push any page on the Navigation stack (back button, black arrow is shown)
3) Push another arbitrary page on the stack (back button, white arrow is shown, but for sure you can't see a white backbutton on a white toolbar, but it's there)
I do not change the back button color programmatically.
See also: https://forums.xamarin.com/discussion/comment/162226
User reported was fixed