WindowNotificationManager with NotificationPosition.BottomCenter incorrectly opens at the top

[lebhero]

Describe the bug
There is an issue with the WindowNotificationManager control in Avalonia when using the NotificationPosition.BottomCenter setting. While the notification is expected to appear at the bottom center of the window, it instead opens at the top of the window. Other NotificationPosition values (e.g., TopLeft, BottomLeft, etc.) work as expected. This behavior seems to be specific to BottomCenter.

<Application.Styles>
    <styling:FluentAvaloniaTheme PreferSystemTheme="False"/>
</Application.Styles>

_windowNotificationManager = new WindowNotificationManager(mainWindow)
{
    MaxItems = 3,
    Position = NotificationPosition.BottomCenter
};
var not = new Notification("Test", "this is a test notification message", NotificationType.Warning);
_windowNotificationManager.Show(not);

Desktop/Platform (please complete the following information):

• Windows (10)
• FluentAvalonia Version [latest]
• Avalonia Version [11.2.3]