custom taxonomy not showing in Gutenberg

Gutenberg does not show our custom taxonomies in the editor sidebar. They have always been there using the classic editor. I have addressed the usual suspects (see below) but had no luck. Here is what I’ve tried:

added “show_in_rest” => true to the $args
added “public” => true to the $args
switched off all plugins (to ensure it is not caused by any of them)
switched back to the old editor via “classic editor” plugin (then they appear again immediately)
ensured I don’t use a reserved word

Here is the code I use to generate the taxonomy – if you have any advice, I would be more than happy to hear your thoughts.



$labels = array(
‘name’ => _x(‘Jahreszeiten’, ‘taxonomy general name’, ‘mysite’),
‘singular_name’ => _x(‘Jahreszeit’, ‘taxonomy singular name’, ‘mysite’),
‘search_items’ => __(‘Jahreszeiten durchsuchen’, ‘mysite’),
‘all_items’ => __(‘Alle Jahreszeiten’, ‘mysite’),
‘parent_item’ => __(‘Übergeordnete Jahreszeit’, ‘mysite’),
‘parent_item_colon’ => __(‘Übergeordnete Jahreszeit:’, ‘mysite’),
‘edit_item’ => __(‘Jahreszeit bearbeiten’, ‘mysite’),
‘update_item’ => __(‘Jahreszeit aktualisieren’, ‘mysite’),
‘add_new_item’ => __(‘Neue Jahreszeit hinzufügen’, ‘mysite’),
‘new_item_name’ => __(‘Neue Jahreszeit’, ‘mysite’),
‘menu_name’ => __(‘Jahreszeit’, ‘mysite’),

$rewrite = array(
‘with_front’ => false,
‘hierarchical’ => true,
‘slug’ => __(‘jahreszeit’, ‘mysite’),

$args = array(
‘hierarchical’ => true,
‘labels’ => $labels,
‘show_ui’ => true,
‘show_in_rest’ => true,
‘show_admin_column’ => true,
‘query_var’ => true,
‘rewrite’ => $rewrite,

register_taxonomy(‘jahreszeit’, array(‘post’, ‘pages’), $args);

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