When removing a site in a multisite network the sync-tables form WP-Stateless are still there (wp_XX_sm_sync). I guess there’s no need for them to still be around when the site is removed so they should also be deleted.

https://wordpress.org/support/topic/multisite-network-tables-not-removed-together-with-site/