RSS Feed/News Finder::setDefaultOrder vs Finder::order() differences in multi-column ordering

[ENXF NET]

Suppose a new multi-column sort order is added by extending in \XF\Repository with;
PHP:

public function getDefaultThreadListSortOptions($forAdminConfig): array
{
    $options = parent::getDefaultThreadListSortOptions($forAdminConfig);

$options['MyNewColumnAlias'] = [
        ['MyNewColumn'],
        ['last_post_date'],
    ];

return $options;
}

When set as an explicit forum filter, this results in the following code;
PHP:

$finder->setOrder([
 ['MyNewColumn']...

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