List.direction and list.ordering not set properly after changing filter sorting

Question

I am creating a small backend component using the helloworld example. So far so good.

It is working fine except when I change the ordering using the listbox:

Nothing happens to list.ordering and list.direction. However, list.fullordering is changed okay.

The field in filter_jbburgstand.xml looks like this:

 <fields name="list">
    <field
        name="fullordering"
        type="list"
        label="JGLOBAL_SORT_BY"
        description="JGLOBAL_SORT_BY"
        onchange="this.form.submit();"
        default="ID ASC"
    >
        <option value="">JGLOBAL_SORT_BY</option>
        <option value="ID ASC">ID oplopend</option>
        <option value="ID DESC">ID aflopend</option>
        <option value="IPadres ASC">IPadres oplopend</option>
        <option value="IPadres DESC">IPadres  aflopend</option>
        <option value="Datum ASC">Datum oplopend</option>
        <option value="Datum DESC">Datum aflopend</option>
        <option value="User ASC">Gebruiker oplopend</option>
        <option value="User DESC">Gebruiker aflopend</option>
    </field>

The populate function looks like this:

protected function populateState($ordering = null, $direction = null)    
{         
    parent::populateState($ordering, $direction);
} 

And the ordering part looks like this:

$orderCol   = $this->state->get('list.ordering', '');
$orderDirn  = $this->state->get('list.direction', '');
// $fullOrder = $this->state->get('list.fullordering', '');
$query->order($db->escape($orderCol) . ' ' . $db->escape($orderDirn));
//echo "<br>".$query."<br>";
return $query;

Why does this happen?

Additional information

It looks like onchange="this.form.submit();" is not being executed when I change to a (new) ordering (in the listbox).

I think the adminForm should be reloaded and that is not happening.