WP_Query nested meta_query with OR switching to AND?

Running the latest version of WordPress and I’m trying to do a nested meta_query. The query requires the entry to have a STARTDATE greater than today and at least one WIDGET entry matching an ID (382 below).

As far as I can see, my ARGS are correct, but the resulting query comes out as AND instead of OR. Running the query directly in PHPMyAdmin after converting the AND to OR produces the correct results.

Any help is appreciated.

This is the output of print_r on $args being passed to WP_Query:

Array
(
    [post_type] => jr_events
    [post_status] => Array
        (
            [0] => publish
            [1] => draft
        )

    [meta_query] => Array
        (
            [relation] => AND
            [0] => Array
                (
                    [key] => _jr_start_date
                    [value] => 1441594679
                    [compare] => >=
                )

            [1] => Array
                (
                    [relation] => OR
                    [0] => Array
                        (
                            [0] => Array
                                (
                                    [key] => _jr_widget_0
                                    [value] => 382
                                    [type] => NUMERIC
                                )

                            [1] => Array
                                (
                                    [key] => _jr_widget_64
                                    [value] => 382
                                    [type] => NUMERIC
                                )

                            [2] => Array
                                (
                                    [key] => _jr_widget_65
                                    [value] => 382
                                    [type] => NUMERIC
                                )

                            [3] => Array
                                (
                                    [key] => _jr_widget_66
                                    [value] => 382
                                    [type] => NUMERIC
                                )

                        )

                )

        )

)

The SQL that gets output is as follows:

SELECT SQL_CALC_FOUND_ROWS wp_10_posts.id
FROM   wp_10_posts
       INNER JOIN wp_10_postmeta
               ON ( wp_10_posts.id = wp_10_postmeta.post_id )
       INNER JOIN wp_10_postmeta AS mt1
               ON ( wp_10_posts.id = mt1.post_id )
       INNER JOIN wp_10_postmeta AS mt2
               ON ( wp_10_posts.id = mt2.post_id )
       INNER JOIN wp_10_postmeta AS mt3
               ON ( wp_10_posts.id = mt3.post_id )
       INNER JOIN wp_10_postmeta AS mt4
               ON ( wp_10_posts.id = mt4.post_id )
WHERE  1 = 1
       AND ( ( wp_10_postmeta.meta_key = '_jr_start_date'
               AND Cast(wp_10_postmeta.meta_value AS CHAR) >= '1441594679' )
             AND (( ( mt1.meta_key = '_jr_widget_0'
                      AND Cast(mt1.meta_value AS signed) = '382' )
                    AND ( mt2.meta_key = '_jr_widget_64'
                          AND Cast(mt2.meta_value AS signed) = '382' )
                    AND ( mt3.meta_key = '_jr_widget_65'
                          AND Cast(mt3.meta_value AS signed) = '382' )
                    AND ( mt4.meta_key = '_jr_widget_66'
                          AND Cast(mt4.meta_value AS signed) = '382' ) )) )
       AND wp_10_posts.post_type = 'jr_events'
       AND (( wp_10_posts.post_status = 'publish'
               OR wp_10_posts.post_status = 'draft' ))
GROUP  BY wp_10_posts.id
ORDER  BY wp_10_posts.post_date DESC
LIMIT  0, 10