Look for _get_parent_attribute method in both src and dst dict

When determining which getter style to use for the object in question,
the BaseMeta class should look at both dict's to try and locate the method.

Fixes #18522

lib/ansible/playbook/base.py

@@ -111,7 +111,7 @@ class BaseMeta(type):
                     method = "_get_attr_%s" % attr_name
                     if method in src_dict or method in dst_dict:
                         getter = partial(_generic_g_method, attr_name)
-                    elif '_get_parent_attribute' in dst_dict and value.inherit:
+                    elif ('_get_parent_attribute' in dst_dict or '_get_parent_attribute' in src_dict) and value.inherit:
                         getter = partial(_generic_g_parent, attr_name)
                     else:
                         getter = partial(_generic_g, attr_name)