GTKColumnView / Sorter no works

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I copied this example. The following line is there. sorter = g_object_ref(gtk_column_view_get_sorter(GTK_COLUMN_VIEW(cv)));
But in this version it has exactly the same effect. g_list_store_remove and g_list_store_remove_all clean up properly, but nothing is cleaned up when you exit.

Noob Column Sorting Confusion using GTK4, Columnview, C, looking for a working example

or, add PROP_0 as the first element of the enum. The first property id must be non-zero, which means the first element in the GParamSpec array must be NULL. It’s an implementation detail of how GObject properties work.

I also tried the following. Then it cleans up except for one entry. If there are 4 entries, it takes 3.
g_signal_connect_swapped(scrolled_window, "destroy", G_CALLBACK(g_object_unref), model);
You could live with that in a pinch, but it’s not clean.