Destroying a parented ComboBox triggers a Gtk-CRITICAL ** warning

Steps to reproduce

1. Create a CombBox
2. Add it to a widget hierarchy
3. Call show_all() on the toplevel
4. Destroy the ComboBox

I have attached a small and self-contained example that exhibits the issue.

Current behavior

Destroying the combobox triggers the warning:

Gtk-CRITICAL **: 15:46:41.789: gtk_widget_is_drawable: assertion 'GTK_IS_WIDGET (widget)' failed

Expected outcome

We should get no error message

Version information

Gtk 3.22.30 on Arch Linux

gtk_combo_example.c