Drag-and-drop shape layers broken since GTK4 port

Dragging a shape layer (e.g. GPX) is not working currently after the GTK4 port

(org.gnome.Maps.Devel:2): Gjs-CRITICAL **: 22:58:34.929: JS ERROR: TypeError: files.get_item is not a function
_checkIfFileSizeNeedsConfirmation@resource:///org/gnome/Maps/Devel/js/mapView.js:490:30
openShapeLayers@resource:///org/gnome/Maps/Devel/js/mapView.js:519:27
_initDND/<@resource:///org/gnome/Maps/Devel/js/mainWindow.js:180:34
main@resource:///org/gnome/Maps/Devel/js/main.js:55:24
@resource:///org/gnome/Maps/Devel/js/main.js:58:5