Field Type Taxonomy - Twice taxonomy field bug

Hi,

I need to add two same taxonomy field. They have different id but it's the same field.

array(
          'name'             => __( 'Catégorie', 'omnivit' ),
          'id'               => "_category",
          'type'             => 'taxonomy',
          'taxonomy'         => 'product_category',
          'field_type'       => 'select_tree'
        ),
array(
          'name'        => 'Suggestion Catégorie',
          'id'          => "_similar_category",
          'type'        => 'taxonomy',
          'taxonomy'   => 'product_category',
          'field_type'  => 'select',
        ),

The first is for attribute category to the post, the second is for attribute a second category to make a suggestion on the front.

If I change the second, the first take the same value.

Any clue ?