Why does the plugin does not order terms in get_terms_orderby hook in admin?

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The plugin hooks into the get_terms_orderby filter using the hicpo_get_terms_orderby function. In this function, the first line is if ( is_admin() ) return $orderby;. This prevents the terms from showing in the customized order in the admin listing. If I change the first line to if ( is_admin() ) return 't.term_order'; then it works OK. What is the reason for not showing terms in the custom order in the admin area?