The 'dns-root-data' package is required for unbound to work, but it has recommended status, so install it just to be sure.

diffway · diffway · commit 363701ca095e · 2024-04-06T02:27:31.000+03:00
diff --git a/roles/bootstrap/tasks/install/network.yml b/roles/bootstrap/tasks/install/network.yml
@@ -2,7 +2,9 @@
 
 - name: Install unbound
   ansible.builtin.apt:
-    name: unbound
+    pkg:
+      - dns-root-data
+      - unbound
     state: present
   tags: network
 
