I've run into the same issue.
I found the following query to be the culprit:
SELECT false AS isLoaded, pages.templates_id AS templates_id, pages.*, pages_sortfields.sortfield, (SELECT COUNT(*) FROM pages AS children WHERE children.parent_id=pages.id) AS numChildren,field_title.data AS `title__data`,field_title.data1013 AS `title__data1013`
FROM `pages`
LEFT JOIN pages_sortfields ON pages_sortfields.pages_id=pages.id
LEFT JOIN field_title ON field_title.pages_id=pages.id
WHERE pages.templates_id=44
AND pages.id IN(1009,1013)
GROUP BY pages.id
Also note that the page id 1013 is the language page.
Edit: This is running on
ProcessWire 2.4
PHP 5.4.30
MySQL 5.6.19