Save custom meta on creation and edit of a WooCommerce product_cat

functions.php

<?php

// Save extra taxonomy fields callback function
add_action( 'edited_product_cat', 'save_taxonomy_custom_meta', 10, 2 );  
add_action( 'create_product_cat', 'save_taxonomy_custom_meta', 10, 2 );

function save_taxonomy_custom_meta( $term_id ) {
  if ( isset( $_POST['term_meta'] ) ) {
    $t_id = $term_id;
    $term_meta = get_option( "taxonomy_$t_id" );
    $cat_keys = array_keys( $_POST['term_meta'] );
    foreach ( $cat_keys as $key ) {
      if ( isset ( $_POST['term_meta'][$key] ) ) {
        $term_meta[$key] = wp_kses_post( stripslashes($_POST['term_meta'][$key]) );
      }
    }
    // Save the option array.
    update_option( "taxonomy_$t_id", $term_meta );
  }
}