Incorrect display of Button shortcut access key

[antikmozib]

Description

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="300">
    <Grid>
        <StackPanel Margin="8">
            <Button Content="_Press Me" />
        </StackPanel>
    </Grid>
</Window>

Reproduction Steps

1. Create a new WPF project with .NET 9.
2. Set ThemeMode = "Light" in App.xaml.
3. Add a Button to MainWindow.xaml.
4. Set Button.Content = "_Press Me".

Expected behavior

Actual behavior

Regression?

Yes

Known Workarounds

No response

Impact

No response

Configuration

.NET 9.0.100
VS 2022 17.12
Windows 11 24H2 x64

Other information

No response

[h3xds1nz]

Yeah, well, some controls seem to missing RecognizesAccessKey on their ContentPresenters.

It's my first visit in that XAML and yay, we can't say that's ideal.