UWP BoxView doesn't respect WidthRequest

Description

BoxView doesn't respect WidthRequest on UWP.

Steps to Reproduce

<?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:local="clr-namespace:XFBoxViewUWP"
             x:Class="XFBoxViewUWP.MainPage">

    <StackLayout>
        <!-- Place new controls here -->
        <BoxView Color="Green" WidthRequest="400" HeightRequest="400" CornerRadius="200"/>
    </StackLayout>

</ContentPage>

2. Run

Expected Behavior

A circle should appear.

Actual Behavior

Basic Information

• Version with issue: 3.2, 3.4, 3.6
• Last known good version: Idk
• IDE: Visual Studio 2019
• Platform Target Frameworks:
  • UWP: 17134 (From default blank template)
• Nuget Packages: Default Blank Template
• Affected Devices: Windows devices