On Gutenberg Columns block are rendered properly on the frontend.
Here is a test page:
https://k8s.p4.greenpeace.org/gutenberg/wp-admin/post.php?post=24716&action=edit
On the backend everything look fine, but on the frontend only the "No Image" style seems to rendered properly:
https://k8s.p4.greenpeace.org/gutenberg/columns/