The meta field Addon have the meta value 129456,968945,495435 as string. To use this value in a meta query, you should split the value into an array. Like array( 129456, 968945, 495435 ).
WordPress have a very good function wp_parse_id_list(), which can split comma separated items into array.
<?php if ( ! empty( $addons = get_post_meta( get_the_ID(), 'addons', true ) ) ) : ?>
<?php
$params = array(
'post_type' => 'product',
'meta_key' => 'subproduct',
'meta_value' => wp_parse_id_list( $addons )
);
$wc_query = new WP_Query($params);
?>
<?php while ($wc_query->have_posts()) : $wc_query->the_post(); ?>
<?php include(rh_locate_template('inc/parts/woomain.php')); ?>
<?php endwhile; ?>
<?php wp_reset_postdata(); ?>
<?php endif;?>
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