The system context menu is always shown in a MetroWindow Icon starting with alpha0490

[darbid]

Describe the bug

Starting with alpha0490 the system context menu (with restore, move, close etc) is always shown as the context menu when creating a MetroWindow.IconTemplate. If the window is maximized then upon right clicking the Icon the system menu is shown and then on top the custom context menu from a MetroWindow.IconTemplate

Steps to reproduce

In a any metro window add the template code for the IconTemplate

<mah:MetroWindow.IconTemplate>
    <DataTemplate>
        <Grid Width="30"
              Background="Red">
            <Grid.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Test1" />
                    <MenuItem Header="Test2" />
                </ContextMenu>
            </Grid.ContextMenu>
        </Grid>
    </DataTemplate>
</mah:MetroWindow.IconTemplate>

Expected behavior

Upon right clicking the red grid (see images below) the context menu Test1 and Test2 appear.

Actual behavior

A maximized window shows both the Windows system context menu and the above Grid context menu.
A non-maximized window shows only the Windows system context menu

alpha0476 does not have this behavior

Environment

MahApps.Metro version: v3.0.0 alpha0490 and alpha0492
Windows build number: Win10 OSBuild 19045.4291
Visual Studio:  2022 17.9.6
Target Framework: .Net 8

Screenshots

Not Maximized

Maximized