Cakephp: How to get 2nd level conditional contain without intermediate entities

Question

I execute the following request:

$agPoi = $this->Agpois->get($agPoiId, [
    'contain' => [
        'Agpoititles.Agthemelanguages' => function ($q) use ($languageId) {
            return $q->where([
                'language_id' => $languageId,
            ]);

        }
    ]
]);

Surprisingly, it returns me all agpoititles with only one containing a not empty aghtemelanguage object for which 'language_id' => $languageId.
But I'm not interested by agpoititles not containing an agthemelanguage object.
How to modify the request to only the ones I want?

EDIT

Agpois hasMany Agpoititles
AgpoiTitles belongsTo Agthemelanguages
Agthemelanguages hasOne Agpoititles

SO I expect to get agPoi with THE Agpoititles for which its agthemelanguage->language_id = $languageId

Edit 2

So I tried to use matching() and it works if you pay attention to look for the result in _matchingData as it's explained in the doc ;).

$agPoi = $this->Agpois->find()
              ->contain(['Agpoititles.Agthemelanguages'])
              ->matching('Agpoititles.Agthemelanguages', function ($q) use ($languageId, $poiId) {
                   return $q->where([
                      'Agpois.id' => $poiId,
                      'language_id' => $languageId
                      ]);
                  }
              )
              ->first();