Hello,
As I can see, the page https://news.seoul.dulwich.org/whole-school-23-june-2023/ is a single post page. While you are trying to get term meta on the page so it does not work.
Or maybe the Bricks builder does not support outputting the term meta value. You can try to contact their support to get more information.
Or try to use the shortcode to output the field value
[rwmb_meta id="cat-color" object_id="15" object_type="term"]
Read more in the documentation https://docs.metabox.io/shortcode/
.
