unreachable delegation fix

lib/ansible/plugins/strategy/__init__.py

@@ -630,9 +630,17 @@ class StrategyBase:
             elif task_result.is_unreachable():
                 ignore_unreachable = original_task.ignore_unreachable
                 if not ignore_unreachable:
-                    self._tqm._unreachable_hosts[original_host.name] = True
-                    iterator._play._removed_hosts.append(original_host.name)
-                    self._tqm._stats.increment('dark', original_host.name)
+                    delegated_host = result.get('ansible_delegated_host', None)
+                    if original_task.delegate_to is not None and delegated_host:
+                        self._tqm._unreachable_hosts[delegated_host] = True
+                        iterator._play._removed_hosts.append(delegated_host)
+                        if origianl_host.name not in self._tqm._unreachable_hosts:
+                            iterator.mark_host_failed(original_host)
+                        self._tqm._stats.increment('failures', original_host.name)
+                    else:
+                        self._tqm._unreachable_hosts[original_host.name] = True
+                        iterator._play._removed_hosts.append(original_host.name)
+                        self._tqm._stats.increment('dark', original_host.name)
                 else:
                     self._tqm._stats.increment('ok', original_host.name)
                     self._tqm._stats.increment('ignored', original_host.name)