gtk4-rs dispose_template dispose doesn't dispose non-bound widgets

Dispose tempalte disposes only bound widgets. Is there a way to dispose all children graph?

Here are the details.

Object implementation:

    #[derived_properties]
    impl ObjectImpl for MyWidget {
        fn constructed(&self) {
            self.parent_constructed();
        }

        fn dispose(&self) {
            self.dispose_template();
        }
    }

Template:

<?xml version="1.0" encoding="UTF-8"?>
<interface>
    <template class="MyWidget" parent="GtkWidget">
        <property name="layout-manager">
            <object class="GtkBoxLayout">
                <property name="orientation">vertical</property>
                <property name="spacing">12</property>
            </object>
        </property>

        <child>
            <object class="GtkLabel" id="label">
                <style><class name="title-3"/></style>
                <property name="label" bind-source="MyWidget" bind-property="text" bind-flags="sync-create" />
                <property name="vexpand">true</property>
            </object>
        </child>

        <child>
            <object class="GtkBox">
                <style><class name="pink"/></style>
                <child>
                    <object class="GtkSpinner" id="spinner">
                        <property name="halign">center</property>
                        <property name="valign">center</property>
                        <property name="hexpand">true</property>
                        <property name="vexpand">true</property>
                        <property name="width-request">48</property>
                        <property name="height-request">48</property>

                        <property name="spinning">true</property>
                    </object>
                </child>
            </object>
        </child>
    </template>
</interface>

There are three widgets on a template

1. GtkLabel bound to field "label" - disposed
2. GtkBox - not bound to field, not disposed (this one is the problem)
3. GtkSpinner - bound to field "spinner" - dispsed

I'd expect dispose_template will dispose all children.

Do I really have to have backing field for every widget mentioned on template? or I'm missing something