local tile source broken in gnome-maps 43

I'm using local tiles via the --local option, but this is broken in gnome-maps 43. I was able to fix a first issue by replacing here normalStartup = false; with Application.normalStartup = false;, but then I get another bug that I don't know how to fix:

(org.gnome.Maps:46): Gjs-CRITICAL **: 23:05:36.320: JS ERROR: ReferenceError: renderer is not defined
setMapType@resource:///org/gnome/Maps/js/mapView.js:450:17
MapView@resource:///org/gnome/Maps/js/mapView.js:147:14
MainWindow@resource:///org/gnome/Maps/js/mainWindow.js:102:25
_createWindow@resource:///org/gnome/Maps/js/application.js:181:28
vfunc_activate@resource:///org/gnome/Maps/js/application.js:200:14
vfunc_command_line@resource:///org/gnome/Maps/js/application.js:347:18
main@resource:///org/gnome/Maps/js/main.js:55:24
@resource:///org/gnome/Maps/js/main.js:58:5

I'm happy to test if you guide me through a possible fix.