Strange behavior: getCollectionGraph only returns a single tv (possible bug)

<?php

$location = $modx->getOption('id', $scriptProperties, $modx->resource->get('id'));
$levelType = $modx->getOption('leveltype', $scriptProperties, '');
$outputSeparator = $modx->getOption('outputSeparator', $scriptProperties, ',');
 
// load migxresourcerelations class
$packageName = 'migxresourcerelations';
$packagepath = $modx->getOption('core_path') . 'components/' . $packageName . '/';
$modelpath = $packagepath . 'model/';
 
$loaded = $modx->addPackage($packageName, $modelpath, $prefix);
if (! $loaded) {return 'failed to add ' . $packageName;}
$classname = 'rrResourceRelation';
 
 
// determine current category and set featured TV
$relName = 'clinics';
$relTV = 67;
 
// get ids of all sub-areas and their clinics
$areas = $modx->getChildIds($location,5,array('context' => 'web'));
$areas = array_unique($areas);
 
// get clinic data
$clinics = $clinicIDs = array();
$criteria = $modx->newQuery('modResource');
$criteria->distinct();
$criteria->select('id','pagetitle','alias');
$criteria->where(array('id:IN' => $areas, 'template' => '2'));
$criteria->sortby('pagetitle','ASC');
$collection = $modx->getCollection('modResource', $criteria);
foreach ($collection as $clinic) {
    $clinics[$clinic->get('id')]['alias'] =  $clinic->get('alias');
    $clinics[$clinic->get('id')]['title'] =  $clinic->get('pagetitle');
    $clinicIDs[] = $clinic->get('id');
}
$clinicIDs = array_unique($clinicIDs);


//get doctor data

//$scriptProperties['parents'] = '213';
$scriptProperties['return'] = 'data';
//$scriptProperties['return'] = 'sql';
$scriptProperties['includeTVs'] = 'resourcealbum';//<- put here your tv-names
$scriptProperties['loadModels'] = 'migxresourcerelations';
$scriptProperties['leftJoin'] = '[{"class":"rrResourceRelation","alias":"Source","on":"Source.source_id = modResource.id"}]';
$scriptProperties['select'] = '{"modResource":"pagetitle","Source":"target_id AS Source_target_id,source_id AS Source_source_id"}';
$scriptProperties['where'] = '{"Source.target_id:IN":['.implode(',',$clinicIDs).']}';
$scriptProperties['limit'] = 0;

/* @var pdoFetch $pdoFetch */
$fqn = $modx->getOption('pdoFetch.class', null, 'pdotools.pdofetch', true);
if (!$pdoClass = $modx->loadClass($fqn, '', false, true)) {return false;}
$pdoFetch = new $pdoClass($modx, $scriptProperties);
$pdoFetch->addTime('pdoTools loaded');
$output = $pdoFetch->run();

echo '<pre>' . print_r($output,1) . '</pre>';

/* 
 
//get doctor data
$criteria = array();
$criteria['rrResourceRelation.target_id:IN'] = $clinicIDs;
$criteria['TemplateVarResources.tmplvarid:IN'] = array(44,41,40,$relTV);
$criteria = $modx->newQuery('rrResourceRelation', $criteria);
$items = $modx->getCollectionGraph('rrResourceRelation','{"Source":{"TemplateVarResources":{}}}',$criteria);
 
//this is debug code to figure out why not all tvs are being returned
// the actual code is commented below under 'prepare doctor output'
$target = array();
foreach ($items as $item) {
        $target[] = $item->get('source_id');
        $target[] = $item->Source->get('pagetitle');
        $tvs = array();
    $tvCount = 0;
    foreach($item->Source->TemplateVarResources as $tvr) {
            $tvs[$tvr->get('id')] = $tvr->get('value');
        $tvCount++;
        }
}
$target[] = $tvs;
 
$doctorCount = $tvCount;
$clinicOutput = $target;
*/
 
/*
// prepare doctor output
$featuredCount= 0;
$doctorCount = 0;
$doctorOutput = '';
if (!empty($items)) {
    foreach ($items as $item) {
        if (is_object($item)) {
            $doctorCount++;
            $clinicTitle = $item->Target->get('pagetitle');
            $clinicAlias = $item->Target->get('alias');
            $doctorName = $item->Source->get('pagetitle');
            $doctorID = $item->Source->get('id');
            $featured = '';
            $photo = '';
            // get template var values
            foreach ($item->Source->getMany('TemplateVarResources') as $tvr) {
                switch ($tvr->get('tmplvarid')) {
                    case 40:
                        //
                        $photo = $tvr->get('value');
                        $photo = (! empty($photo) ? $photo : '[[++theme_base_dir]]images/gallery-img3.jpg');
                        break;
                    case $relTV:
                        // featured_in_...
                        if ($tvr->get('value') == 1) {
                            ++$featuredCount;
                            $featured = 'featured';
                        }
                }
            }
            // generate output
            $doctorOutput .= '<article class="entry '.$clinicAlias.' '.$featured.'"><div class="gallery-thumb"><img src="'.$photo.'"></div><p><a href="[[~' .$doctorID. ']]">' . $doctorName . '</a></p></article>';
        }
    }
}
 
 
// prepare clinic filters
$url = $modx->makeUrl($modx->resource->get('id'));
$url = substr($url, 0, -1).'#';
 
$clinicOutput = '<li><a href="'. $url .'featured" class="selected" data-filter=".featured">Featured</a></li>';
foreach ($clinics as $clinic) {
    $clinicOutput .= '<li><a href="'.$url.$clinic['alias'].'" data-filter=".'.$clinic['alias'].'">'.$clinic['title'].'</a></li>';
}
*/
 
$modx->setPlaceholder('doctorcount', $doctorCount);
$modx->setPlaceholder('filter', $clinicOutput);
$modx->setPlaceholder('doctors', $doctorOutput);
 
return '';