NumericUpDown Focus doesn't work if set through FocusManager

[KKauK]

I'm still experiencing the same issue as already reported in #3042
Trying to set focus to NumericUpDown through FocusManager doesn't work . E.g.:

<StackPanel FocusManager.FocusedElement="{Binding ElementName=nud}"> <Button Name="firstButton" Height="50"/> <TextBox Name="txtBox" Width="300" Height="50" Text="Text"/> <mah:NumericUpDown Name="nud" Width="300" Height="50" Background="beige" Focusable="true" UpDownButtonsFocusable="False" Value="200"/> </StackPanel>

Any help is apprechiated!
Thank you!

MahApps.Metro version: 3.0.0-alpha0457
Visual Studio: 2022 17.6.3
Target Framework: v4.7.2