sphinx/util/nodes.py:335: TypeError with Sphinx 5.3.0

[marxin]

Can be seen in openSUSE staging project:
https://build.opensuse.org/build/openSUSE:Factory:Staging:B/standard/x86_64/python-breathe/_log

fails due to:

[   27s] state = <test_renderer.MockState object at 0x7fb651406760>, content = None
[   27s] node = <desc_content: >
[   27s] 
[   27s]     def nested_parse_with_titles(state: Any, content: StringList, node: Node) -> str:
[   27s]         """Version of state.nested_parse() that allows titles and does not require
[   27s]         titles to have the same decoration as the calling document.
[   27s]     
[   27s]         This is useful when the parsed content comes from a completely different
[   27s]         context, such as docstrings.
[   27s]         """
[   27s]         # hack around title style bookkeeping
[   27s] >       surrounding_title_styles = state.memo.title_styles
[   27s] E       AttributeError: 'MockState' object has no attribute 'memo'
[   27s] 
[   27s] /usr/lib/python3.8/site-packages/sphinx/util/nodes.py:335: AttributeError

[marxin]

Should be also visible in #864.