The full traceback is:
Traceback (most recent call last):
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/executor/task_executor.py", line 165, in run
    res = self._execute()
          ^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/executor/task_executor.py", line 656, in _execute
    result = self._handler.run(task_vars=vars_copy)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/etc/ansible/ansible_collections/openstack/config_template/plugins/action/config_template.py", line 889, in run
    resultant = self._check_templar(data=template_data, extra=_vars)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/etc/ansible/ansible_collections/openstack/config_template/plugins/action/config_template.py", line 787, in _check_templar
    return templar.template(
           ^^^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/template/__init__.py", line 771, in template
    result = self.do_template(
             ^^^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/template/__init__.py", line 1015, in do_template
    res = myenv.concat(rf)
          ^^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/template/native_helpers.py", line 83, in ansible_concat
    return ''.join([to_text(v) for v in nodes])
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/template/native_helpers.py", line 83, in <listcomp>
    return ''.join([to_text(v) for v in nodes])
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<template>", line 339, in root
  File "/opt/ansible-runtime/lib/python3.11/site-packages/ansible/template/__init__.py", line 295, in wrapper
    ret = func(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/ansible-runtime/lib/python3.11/site-packages/jinja2/filters.py", line 367, in do_dictsort
    return sorted(value.items(), key=sort_func, reverse=reverse)
                  ^^^^^^^^^^^
AttributeError: 'int' object has no attribute 'items'
fatal: [ost01-cinder-volumes-container-25ad06a8]: FAILED! => {
    "msg": "Unexpected failure during module execution: 'int' object has no attribute 'items'",
    "stdout": ""
}