Xamarin.Forms ListView does not highlight selected item?

Trying to ramp up a new project on Xamarin.Forms, and on iOS 13 no highlight is being shown on my ListViews. Using Visual Studio for Mac's out-of-the-box "Blank Forms App" solution, I changed the contents on MainPage.xaml to this:

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="ListViewTest.MainPage">
    <StackLayout>
        <ListView SelectionMode="Single">
            <ListView.ItemsSource>
                <x:Array Type="{x:Type x:String}">
                    <x:String>mono</x:String>
                    <x:String>monodroid</x:String>
                    <x:String>monotouch</x:String>
                    <x:String>monorail</x:String>
                    <x:String>monodevelop</x:String>
                    <x:String>monotone</x:String>
                    <x:String>monopoly</x:String>
                    <x:String>monomodal</x:String>
                    <x:String>mononucleosis</x:String>
                </x:Array>
            </ListView.ItemsSource>
        </ListView>
    </StackLayout>

When "monotouch" is selected, the view looks like the image attached below, both in the simulator and on the device. I would have expected a gray selection bar on the "monotouch" row, but instead it only modified the row borders.

This is on Xamarin.Forms 4.3.0.908675 (the latest as of this date). I tried rolling back to Forms 4.0 and 3.6 and saw the same results on both, which makes it seem like something new in iOS 13?

I tried searching for someone else having the issue, but only found articles on changing or hiding the highlight color; I'm just looking to match the system behavior.

Has anyone else bumped into this? Any ideas? Thanks!