Translations:GNOME/GDM/29/en

GDM normally use SystemD to get the system keyboard configuration. If not, GDM will use the X configuration. But if you are using the default Gnome profile on Gentoo, you will be using OpenRC and Wayland, so none of this may work. GDM will then use a default keyboard, which will make it difficult to type a password if this is not your layout.