Changing Custom Post Type’s name


I have difficulties to rewrite the slug of a custom post type… Previously the CPT was named ‘conversations’ but I have to change it for ‘instruments’. I’ve made all the labelling changes but I can’t make the slug rewriting working properly. The url of the posts keep being (permalinks refreshed).

Please find my code below :

function elro_cpt_instruments() {
    $labels = array(
        'name' => 'Instruments',
        'all_items' => 'Tous les Instruments',
        'singular_name' => 'Instrument',
        'add_new_item' => 'Ajouter un instrument',
        'edit_item' => 'Modifier cet instrument',
        'menu_name' => 'Instruments',
        'rewrite' => array('slug' => 'instruments'),
    $args = array(
        'labels' => $labels,
        'public' => true,
        'show_in_rest' => true,
        'has_archive' => false,
        'supports' => array( 'title', 'editor','thumbnail' ),
        'menu_position' => 5, 
        'menu_icon' => 'dashicons-book-alt',
    register_post_type( 'conversations', $args );

add_action( 'init', 'elro_cpt_instruments', 0 );

I could write a filter to do that but I’d prefer my slug rewriting to work into my CPT declaration.

What am I doing wrong?
Thanks by advance for your help!

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