Why doesn't nestTables work in nodejs mysqljs/mysql?

Question

Node.js

Hello. I use https://github.com/mysqljs/mysql.
Why is there only 1 element in games_img?

{ games: { id: 1 }, games_img: {... } } 

{sql: 'SELECT games.id, games_img.game_id, games_img.url FROM games LEFT JOIN games_img ON games.id = games_img.game_id GROUP BY games_img.game_id', nestTables:  true}