Cannot navigate context menu of GtkLabel with keyboard

Steps to reproduce

1. Open gtk-demo
2. Open the about dialog
3. Navigate to the content of the first tab with the keyboard and select some text
4. Open the context menu

Current behavior

The context menu opens, it is possible to activate the selected menu item directly with Enter. However it is not possible to navigate to another menu item with the up and down arrows, pressing those keys actually navigates between the paragraphs behind the popover while keeping the popover open. It also shows the mnemonics of the context menu items and using the mnemonics is the only way to activate those menu items.

Expected outcome

It should be possible to navigate inside the context menu with the up and down arrows and activate any menu item that way.

Version information

• GTK 4.17.2-818d5952 (using the GTK4 demo Flatpak from GNOME nightly)
• Fedora 41 Silverblue
• Wayland