You have been careful in not telling us the versions of every component.
I assume, since you’re talking about upgrades, that you have installed xdg-desktop-portal 1.18? In which case you need to configure the portal to include the GTK portal, i.e. put this in $HOME/.config/xdg-desktop-portal/portals.conf
[preferred]
default=hyprland;gtk
and make sure to restart xdg-desktop-portal and/or your session.