Multilingual Page List

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Any reason why this will only work if im in edit mode??

$parentPage = Page::getByID($c->getCollectionParentID());
$tree = $parentPage->getSiteTreeObject();
$eventlist->setSiteTreeObject($tree);

I have added a page list into my page and i see it to work with Multilingual. At the moment its only showing the UK pages on the Page version of the page.