Query vars failing to find connected posts

[philipjohn]

In attempting a custom Query using P2P's query vars I'm struggling to get anything back that makes sense.

My end goal is a list of videos that are connected to a single event.

My connection:

p2p_register_connection_type( array(
    'name'        => 'event_videos',
    'from'        => 'video',
    'to'          => 'event',
    'cardinality' => 'many-to-one',
    'sortable'    => 'any',
) );

I have an event (58059) connected to a single video (61427). I am attempting to retrieve all videos connected to the event 58059. I'm using this code to test the query:

require_once 'wp-load.php';

$q = new WP_Query( array(
    'connected_items' => 58059,
    'connected_type' => 'event_videos',
    'post_type' => 'any',
) );

if ( $q->have_posts() ) {

echo '<ul>';

    while ( $q->have_posts() ) {

        $q->the_post();

        echo '<li>' . get_post_type( get_the_ID() ) . ': ' . get_the_ID() . '</li>';

    }

    echo '</ul>';

}

else {
    echo 'No posts.';
}

This results in No posts. which is unexpected. I expect a list with one item - the ID of my single linked video 61427.

I've tried these variations for query args;

'connected_items' => 58059,
'connected_direction' => 'from',
'connected_type' => 'event_videos',
'post_type' => 'any',

...and changing connected_direction to "to" and "any" produces the same result.

'connected_direction' => 'from',
'connected_type' => 'event_videos',
'post_type' => 'any',

The above produces a list of events, but changing 'connected_direction' to 'to' produces no results, which makes me think there is something wrong with one side of the connection.

Edit: Worth nothing is that when I hook pre_get_posts and dump the query there are three queries performed; the first with post_type set to all, the second set to 'video' and the third to 'event'. That second query includes 'post__in' with 58059 as the value, which clearly isn't going to work. You can see that on pastebin.