[ids] missing from render callback

i hook into gallery render callback and noticed when i enable your plugin, the ids of each image is missing in the callback function.

function foo_check_block() {
    register_block_type( 'core/gallery', array(
        'render_callback' => 'foo_block_gallery_render',
    ) );
}
add_action( 'init', 'foo_check_block' );
function foo_block_gallery_render( $attributes, $content ) {
    write_log($attributes);    
    return $content;
}

print_r:

[28-Nov-2019 11:01:54 UTC] Array
(
    [ids] => Array
        (
            [0] => 1317
            [1] => 1316
            [2] => 1315
            [3] => 1314
            [4] => 1313
            [5] => 1312
        )

    [imageCrop] => 
    [linkTo] => media
)

with your plugin:

[28-Nov-2019 11:01:54 UTC] Array
(
    [imageCrop] => 
    [linkTo] => media
)

why? can you please insert ids. thank you