GTK dialog not correctly centered on Microsoft Windows

On Microsoft Windows, transient dialogs are note correctly centered on their parent window.

Steps to reproduce

1. On Microsoft Windows, create file prog.c :

#include <gtk/gtk.h>
GtkWidget* window = NULL;

static void show_dialog_cb(GtkWidget* button){
        GtkWidget* dialog = gtk_dialog_new();
        gtk_window_set_default_size (GTK_WINDOW (dialog), 200, 100);
        gtk_window_set_transient_for(GTK_WINDOW(dialog), GTK_WINDOW(window));
        //gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
        gtk_window_set_destroy_with_parent (GTK_WINDOW(dialog), TRUE);
        gtk_widget_show (dialog);
}

static void my_application_activate_cb(GApplication* my_application, gpointer user_data) {
        window = gtk_application_window_new(GTK_APPLICATION(my_application));
        gtk_window_set_default_size (GTK_WINDOW (window), 400, 300);
        gtk_widget_show(window);
        gchar* title = g_strdup_printf("GTK %i.%i.%i",  gtk_get_major_version(), gtk_get_minor_version(), gtk_get_micro_version());
        gtk_window_set_title(GTK_WINDOW(window), title);
        g_free(title);

        GtkWidget* button = gtk_button_new_with_label("Show dialog");
        g_signal_connect(button, "clicked", G_CALLBACK(show_dialog_cb), NULL);
        gtk_widget_show(button);
#if (GTK_MAJOR_VERSION == 3)
        gtk_container_add(GTK_CONTAINER(window), button);
#elif (GTK_MAJOR_VERSION == 4)
        gtk_window_set_child(GTK_WINDOW(window), button);
#else
        #error("not supported")
#endif
}

int main( int argc, char *argv[] ) {
        GtkApplication* my_application = gtk_application_new(NULL, G_APPLICATION_FLAGS_NONE);
        g_signal_connect (my_application, "activate", G_CALLBACK (my_application_activate_cb), NULL);
        int status = g_application_run(G_APPLICATION(my_application), argc, argv);
        g_object_unref(my_application);
        return status;
}

2. Compile this file with GTK3 and GTK4 :

$ gcc -o prog-gtk4 prog.c `pkg-config.exe gtk4 --cflags --libs` -w -mwindows
$ gcc -o prog-gtk3 prog.c `pkg-config.exe gtk+-3.0 --cflags --libs` -w -mwindows

3. start prog-gtk3.exe and prog-gtk4.exeprograms.
4. click on the Show Dialog button.

Current behavior

On GTK 4.0.3, dialog window is not centered on it's parent window :

Expected outcome

Dialog should be centered like in GTK 3.24.26 :

Version information

• GTK 4.0.3
• Microsoft Windows 10
• MinGW64