setupFromQuery() is called too early

public function runSearch(KeywordQuery $query, array $constraints = [], $allowCached = true)
{
    $user = \XF::visitor();
    /** @var Search $search */
    $search = $this->em->create(Search::class);
    $search->setupFromQuery($query, $constraints);
    $search->user_id = $user->user_id;
    if ($allowCached && $this->allowUserUseCachedResults($user))
    {
        $previous = $this->getPreviousSearch($query, $user);
    }
    else
    {...