Thunar keyboard shortcuts are not initialized when opening preferences dialog from settings menu

Version information

12e180ec on Arch Linux

Steps to reproduce

Log in to a new session
From the Applications Menu, select Settings > Thunar Preferences
Click on the Shortcuts tab
Notice that the shortcuts are not initialized / listed properly

Current behavior

The shortcuts are not initialized when opening the preferences dialog from the Settings menu. If I open the preferences dialog from within Thunar, the shortcuts are displayed properly.

Expected outcome

The shortcuts are displayed properly regardless of how the preferences dialog is opened.

Backtrace

Example Valgrind trace:

Conditional jump or move depends on uninitialised value(s)
   at 0x4C53B2B: _gtk_accel_label_class_get_accelerator_label (gtkaccellabel.c:784)
   by 0x4C52D31: gtk_accelerator_get_label (gtkaccelgroup.c:1712)
   by 0x48DE769: xfce_shortcuts_editor_create_contents (xfce-shortcuts-editor.c:490)
   by 0x48DF30A: xfce_shortcuts_editor_new_variadic (xfce-shortcuts-editor.c:266)
   by 0x48DF3AF: xfce_shortcuts_editor_new (xfce-shortcuts-editor.c:181)
   by 0x18CE71: thunar_preferences_dialog_init (thunar-preferences-dialog.c:1426)
   by 0x56FC768: g_type_create_instance (gtype.c:1951)
   by 0x56DEABA: g_object_constructor (gobject.c:2981)
   by 0x48F8ED1: xfce_titled_dialog_constructor (xfce-titled-dialog.c:154)
   by 0x56DECE0: g_object_new_with_custom_constructor (gobject.c:2524)
   by 0x56DEF6A: g_object_new_internal (gobject.c:2604)
   by 0x56E082D: g_object_new_with_properties (gobject.c:2769)
   by 0x56E166E: g_object_new (gobject.c:2415)
   by 0x18D671: thunar_preferences_dialog_new (thunar-preferences-dialog.c:1521)
   by 0x1568D2: thunar_dbus_service_display_preferences_dialog (thunar-dbus-service.c:752)
   by 0x137803: _g_dbus_codegen_marshal_BOOLEAN__OBJECT_STRING_STRING (thunar-dbus-service-infos.c:444)
   by 0x137874: thunar_dbus_file_manager_method_marshal_display_preferences_dialog (thunar-dbus-service-infos.c:1978)
   by 0x56D8D17: g_closure_invoke (gclosure.c:833)
   by 0x56EBF3B: signal_emit_unlocked_R (gsignal.c:3887)
   by 0x56F4C3C: signal_emitv_unlocked (gsignal.c:3211)
   by 0x56F4C3C: g_signal_emitv (gsignal.c:3111)
   by 0x13921D: _thunar_dbus_file_manager_skeleton_handle_method_call (thunar-dbus-service-infos.c:5120)
   by 0x54D3863: g_dbus_interface_method_dispatch_helper (gdbusinterfaceskeleton.c:618)
   by 0x54D3BE0: skeleton_intercept_handle_method_call (gdbusinterfaceskeleton.c:660)
   by 0x54B9C1A: call_in_idle_cb (gdbusconnection.c:5458)
   by 0x55D54C6: g_idle_dispatch (gmain.c:6247)
   by 0x55D689B: g_main_dispatch (gmain.c:3361)
   by 0x55D9270: g_main_context_dispatch_unlocked (gmain.c:4212)
   by 0x55D9270: g_main_context_iterate_unlocked (gmain.c:4277)
   by 0x55D983D: g_main_context_iteration (gmain.c:4342)
   by 0x548E7AF: g_application_run (gapplication.c:2715)
   by 0x13F9E8: main (main.c:86)