strange behavior in 'select' strategy

Question

I have strange behavior in a query where I use the select strategy in a contain.

Basically, the query is made to get Sitedescription's content in the requested language if exists, if not, in english, if it doesn't exist, in French :

$query = $this->Sites->find()
->contain(
    [
        'Sitedescriptions' => [
            'strategy' => 'select',
            'queryBuilder' => function ($q) use ($reqLanguage_id, $reqLanguageFr_id, $reqLanguageEn_id) {
                return $q
                    ->select(['isGivenLanguage' => $q->newExpr()->eq('language_id', $reqLanguage_id), 'site_id', 'language_id')
                    ->where (['language_id IN ' => [$reqLanguage_id, $reqLanguageFr_id, $reqLanguageEn_id]])
                    ->order(['isGivenLanguage' => 'DESC', 'language_id' => 'DESC'])
                    ->limit(1)
                    ;
                 },
            ],
    ])
;

This one works just fine. Now I want to make te exact same query but I also want to get one more field from sitedescription, 'paragraph_0'. An existing field of course.

$query = $this->Sites->find()
->contain(
    [
        'Sitedescriptions' => [
            'strategy' => 'select',
            'queryBuilder' => function ($q) use ($reqLanguage_id, $reqLanguageFr_id, $reqLanguageEn_id) {
                return $q
                    ->select(['isGivenLanguage' => $q->newExpr()->eq('language_id', $reqLanguage_id), 'site_id', 'language_id', 'paragraph_0')
                    ->where (['language_id IN ' => [$reqLanguage_id, $reqLanguageFr_id, $reqLanguageEn_id]])
                    ->order(['isGivenLanguage' => 'DESC', 'language_id' => 'DESC'])
                    ->limit(1)
                    ;
                 },
            ],
    ])
;

Adding this field in select() makes the query to return an empty Sitedescription's array.

Query and outputs are given here https://gist.github.com/caBBAlainB/a721eebb3e8aa04a3506.

Any idea on the reason why the additional field is a problem?

EDIT Add generated sql queries for the second case, where paragraph_0 is requested:

With limit(1):

SHOW FULL COLUMNS FROM `sitedescriptions`  
SHOW INDEXES FROM `sitedescriptions`  
SELECT * FROM information_schema.key_column_usage AS kcu INNER JOIN information_schema.referential_constraints AS rc ON (kcu.CONSTRAINT_NAME = rc.CONSTRAINT_NAME) WHERE kcu.TABLE_SCHEMA = 'modulwoomobtst' AND kcu.TABLE_NAME = 'sitedescriptions' and rc.TABLE_NAME = 'sitedescriptions'  
SHOW TABLE STATUS WHERE Name = 'sitedescriptions'  
SELECT (language_id = '1') AS `isGivenLanguage`, Sitedescriptions.id AS `Sitedescriptions__id`, Sitedescriptions.site_id AS `Sitedescriptions__site_id`, Sitedescriptions.language_id AS `Sitedescriptions__language_id`, Sitedescriptions.paragraph_0 AS `Sitedescriptions__paragraph_0` FROM sitedescriptions Sitedescriptions WHERE (Sitedescriptions.site_id in (63,64,827,828,838,841,849,859,866,908,1034,1116) AND language_id in (1,1,9)) ORDER BY isGivenLanguage DESC, language_id DESC

Without limit(1):

SHOW FULL COLUMNS FROM `sitedescriptions`  
SHOW INDEXES FROM `sitedescriptions`  
SELECT * FROM information_schema.key_column_usage AS kcu INNER JOIN information_schema.referential_constraints AS rc ON (kcu.CONSTRAINT_NAME = rc.CONSTRAINT_NAME) WHERE kcu.TABLE_SCHEMA = 'modulwoomobtst' AND kcu.TABLE_NAME = 'sitedescriptions' and rc.TABLE_NAME = 'sitedescriptions'  
SHOW TABLE STATUS WHERE Name = 'sitedescriptions'  
SELECT (language_id = '1') AS `isGivenLanguage`, Sitedescriptions.id AS `Sitedescriptions__id`, Sitedescriptions.site_id AS `Sitedescriptions__site_id`, Sitedescriptions.language_id AS `Sitedescriptions__language_id`, Sitedescriptions.paragraph_0 AS `Sitedescriptions__paragraph_0` FROM sitedescriptions Sitedescriptions WHERE (Sitedescriptions.site_id in (63,64,827,828,838,841,849,859,866,908,1034,1116) AND language_id in (1,1,9)) ORDER BY isGivenLanguage DESC, language_id DESC

As far as I can see, both requests are the same but the result is different.