MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="PathGradientRepro.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    <ScrollView>
        <VerticalStackLayout Margin="30,0" Spacing="35">
            <VerticalStackLayout.Resources>
                <ResourceDictionary>
                    <LinearGradientBrush x:Key="LinearGradient">
                        <LinearGradientBrush.GradientStops>
                            <GradientStop Offset="0" Color="Red" />
                            <GradientStop Offset="0.5" Color="Blue" />
                            <GradientStop Offset="0.9" Color="Purple" />
                        </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>

                    <RadialGradientBrush x:Key="RadialGradient">
                        <RadialGradientBrush.GradientStops>
                            <GradientStop Offset="0" Color="Red" />
                            <GradientStop Offset="0.5" Color="Blue" />
                            <GradientStop Offset="0.9" Color="Purple" />
                        </RadialGradientBrush.GradientStops>
                    </RadialGradientBrush>
                </ResourceDictionary>
            </VerticalStackLayout.Resources>

            <VerticalStackLayout Margin="30,0" Spacing="35">
                <Label Text="Non-working (Stroke does not apply gradient)" />
                <Path
                    x:Name="ArcPath"
                    Fill="{StaticResource LinearGradient}"
                    Stroke="{StaticResource LinearGradient}"
                    StrokeThickness="20">
                    <Path.Data>
                        <PathGeometry>
                            <PathFigureCollection>
                                <PathFigure StartPoint="0,0">
                                    <ArcSegment
                                        IsLargeArc="False"
                                        Point="120,140"
                                        Size="100,100"
                                        SweepDirection="Clockwise" />
                                </PathFigure>
                            </PathFigureCollection>
                        </PathGeometry>
                    </Path.Data>
                </Path>
                <Ellipse
                    Fill="{StaticResource LinearGradient}"
                    HeightRequest="50"
                    Stroke="{StaticResource LinearGradient}"
                    StrokeThickness="10"
                    WidthRequest="50" />
            </VerticalStackLayout>
            <VerticalStackLayout Margin="30,0" Spacing="35">
                <Label Text="Working (Border does apply gradient)" />
                <Border
                    HeightRequest="100"
                    Stroke="{StaticResource LinearGradient}"
                    StrokeShape="RoundRectangle 15"
                    StrokeThickness="20"
                    WidthRequest="100" />

                <Border
                    HeightRequest="400"
                    Stroke="{StaticResource LinearGradient}"
                    StrokeThickness="20"
                    WidthRequest="400">
                    <Border.StrokeShape>
                        <Path Fill="{StaticResource LinearGradient}">
                            <Path.Data>
                                <PathGeometry>
                                    <PathFigure StartPoint="0,0">
                                        <ArcSegment
                                            IsLargeArc="False"
                                            Point="120,140"
                                            Size="100,100"
                                            SweepDirection="Clockwise" />
                                    </PathFigure>
                                </PathGeometry>
                            </Path.Data>
                        </Path>
                    </Border.StrokeShape>
                </Border>
            </VerticalStackLayout>
        </VerticalStackLayout>
    </ScrollView>

</ContentPage>