WP Plugin Auto-Updates Broken

WordPress plugins with auto-update enabled never update due to a bug in LearnPress. The auto_update_plugin filter does not return the unfiltered value. LearnPress version 3.1.7.

function learnpress_disable_auto_update( $update, $item ) {
        $plugins = array( // Plugins to  auto-update
                'learnpress',
        );
        // Auto-update specified plugins
        if ( in_array( $item->slug, $plugins ) ) {
                return false;
        }
        return $update; // <---- THIS LINE MISSING
}
add_filter( 'auto_update_plugin', 'learnpress_disable_auto_update', 10, 2 );