Document's fields names are not properly converted to database names in a query

/**
 * @Field(type="date", name="scheduled_at")
 */
private $scheduledAt;

/**
 * @Field(type="date", name="completed_at")
 */
private $completedAt;

$qb->field('scheduledAt')->lte($now)
   ->addOr($qb->expr()->field('completedAt')->lte($now))
   ->addOr($qb->expr()->field('completedAt')->equals(null))
   ->sort('scheduledAt', 'asc');

db.foo.find({
    "scheduled_at": { "$lte": new Date(...) }, 
    "$or": [ 
        { "completed_at": {  "$lte": new Date(...) } }, 
        { "completed_at": null } ] 
})
.sort({ "scheduled_at": 1 });

db.foo.find({
    "scheduled_at": { "$lte": new Date(...) }, 
    "$or": [ 
        { "completedAt": {  "$lte": new Date(...) } }, 
        { "completedAt": null } ] 
})
.sort({ "scheduledAt": 1 });