ahhhhh.php

<?php
function slug_tax_update_PRE( $pieces, $is_new_item, $id ) {
	
	if ( 0 < $id ) {
		$term = (int) $pieces[ 'fields' ][ 'tax' ][ 'value' ];
	
		wp_set_object_terms( $id, $term, 'ant', false );
	}
	
	return $pieces;
	
}
//add_filter( 'pods_api_pre_save_pod_item_cpt', 'slug_tax_update_PRE', 10, 3 );

function slug_tax_update_POST( $pieces, $is_new_item, $id ) {
	
	$term = (int) $pieces[ 'fields' ][ 'tax' ][ 'value' ];
	
	wp_set_object_terms( $id, $term, 'ant', false );
	
	return $pieces;
	
}
add_filter( 'pods_api_post_save_pod_item_cpt', 'slug_tax_update_POST', 10, 3 );