[Grid] Controls in Grid are not clipped by the cells' bounds

[Poker-sang]

Describe the bug

Avalonia's behavior

WinUI3's behavior

WPF's behavior

To Reproduce

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Button
        Grid.Row="0"
        Grid.Column="0"
        Width="80"
        Height="80"
        Content="R0 C0" />
    <Button
        Grid.Row="0"
        Grid.Column="1"
        Width="80"
        Height="40"
        Content="R0 C1" />
</Grid>

Expected behavior

Controls in Grid should be clipped by the cells' bounds

Avalonia version

11.2.1

OS

Windows

Additional context

No response

[Poker-sang]

https://docs.avaloniaui.net/zh-Hans/docs/reference/controls/grid