Comment # 1 on bug 1200614 from Dominique Leuenberger

Added this to gtk3 (and gtk4 as well):

Index: gtk3.changes
===================================================================
--- gtk3.changes (revision 413)
+++ gtk3.changes (revision 132)
@@ -1,4 +1,10 @@
 -------------------------------------------------------------------
+Fri Jun 17 08:35:00 UTC 2022 - Dominique Leuenberger <dimstar@opensuse.org>
+
+- Add dependency "python3x-gobject-Gdk if python3x-gobject" to the
+  typelib package (boo#1200614).
+
+-------------------------------------------------------------------
 Thu May 19 09:52:28 UTC 2022 - Antoine Belvire <antoine.belvire@opensuse.org>

 - Update to version 3.24.34:
Index: gtk3.spec
===================================================================
--- gtk3.spec (revision 413)
+++ gtk3.spec (revision 132)
@@ -143,6 +143,9 @@
 %package -n typelib-1_0-Gtk-3_0
 Summary:        Introspection bindings for the GTK+ toolkit library (version
3)
 Group:          System/Libraries
+Requires:       (python310-gobject-Gdk if python310-gobject)
+Requires:       (python38-gobject-Gdk if python38-gobject)
+Requires:       (python39-gobject-Gdk if python398-gobject)

 %description -n typelib-1_0-Gtk-3_0
 GTK+ is a multi-platform toolkit for creating graphical user interfaces.


both changes are submitted to the devel project and should land reasonably
soon. That should make things a bit more robust