toctree skips an entry if its title begins with an inline icon directive

[demberto]

Describe the bug

Using one of the directives specified over at https://sphinx-design.readthedocs.io/en/furo-theme/badges_buttons.html#inline-icons at the start of a title included in a toctree makes it look small and is skipped by the toctree

However, if I append a trailing backslash (as given below). it works perfectly:

Reproduce the bug

./index.rst:

.. toctree::

   abc

./abc.rst

:fas:`bars-staggered` Understanding descriptors
===============================================

List your environment

Python 3.10.7 venv
Windows 10 64bit

> pip freeze
alabaster==0.7.12
apeye==1.2.0
appdirs==1.4.4
astroid==2.12.9
attrs==22.1.0
autodocsumm==0.2.9
Babel==2.10.3
bandit==1.7.4
beautifulsoup4==4.11.1
black==22.8.0
build==0.8.0
bytesioex==0.1.2
CacheControl==0.12.11
certifi==2022.6.15.1
charset-normalizer==2.1.1
click==8.1.3
colorama==0.4.5
colour==0.1.5
cssutils==2.6.0
dict2css==0.3.0
dill==0.3.5.1
distlib==0.3.6
docutils==0.18.1
dodgy==0.2.1
domdf-python-tools==3.4.0
esbonio==0.14.1
filelock==3.8.0
flake8==5.0.4
flake8-docstrings==1.6.0
flake8-polyfill==1.0.2
flake8-typing-imports==1.13.0
furo==2022.6.21
gitdb==4.0.9
GitPython==3.1.27
html5lib==1.1
idna==3.3
imagesize==1.4.1
iniconfig==1.1.1
isort==5.10.1
Jinja2==3.1.2
lazy-object-proxy==1.7.1
livereload==2.6.3
lockfile==0.12.2
m2r2==0.3.2
Markdown==3.4.1
markdown-it-py==2.1.0
MarkupSafe==2.1.1
mccabe==0.7.0
mdit-py-plugins==0.3.0
mdurl==0.1.2
mistune==0.8.4
msgpack==1.0.4
mypy-extensions==0.4.3
myst-parser==0.18.0
natsort==8.2.0
packaging==21.3
pathspec==0.10.1
pbr==5.10.0
pep517==0.13.0
pep8-naming==0.10.0
platformdirs==2.5.2
pluggy==1.0.0
py==1.11.0
pycodestyle==2.9.1
pydantic==1.9.2
pydocstyle==6.1.1
pyflakes==2.5.0
-e git+https://github.com/demberto/PyFLP.git@44e18203ebbe6ce75b1366d5e647783cea5a9d87#egg=pyflp
pygls==0.12.1
Pygments==2.13.0
pylama==8.4.1
pylint==2.15.2
pylint-celery==0.3
pylint-django==2.5.3
pylint-flask==0.6
pylint-plugin-utils==0.7
pyparsing==3.0.9
pyspellchecker==0.7.0
pytest==7.1.3
pytest-lazy-fixture==0.6.3
pytz==2022.2.1
PyYAML==6.0
requests==2.28.1
requirements-detector==0.7
ruamel.yaml==0.17.21
ruamel.yaml.clib==0.2.6
setoptconf-tmp==0.3.1
six==1.16.0
smmap==5.0.0
snowballstemmer==2.2.0
soupsieve==2.3.2.post1
Sphinx==5.1.1
sphinx-autobuild==2021.3.14
sphinx-autodoc-typehints==1.19.2
sphinx-basic-ng==0.0.1a12
sphinx-copybutton==0.5.0
sphinx-hoverxref==1.1.3
sphinx-jinja2-compat==0.2.0
sphinx-prompt==1.5.0
sphinx-tabs==3.4.1
sphinx-toolbox==3.2.0
sphinx_design==0.3.0
sphinx_inline_tabs==2022.1.2b11
sphinxcontrib-applehelp==1.0.2
sphinxcontrib-devhelp==1.0.2
sphinxcontrib-htmlhelp==2.0.0
sphinxcontrib-images==0.9.4
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.3
sphinxcontrib-serializinghtml==1.1.5
stevedore==4.0.0
tabulate==0.8.10
toml==0.10.2
tomli==2.0.1
tomlkit==0.11.4
tornado==6.2
tox==3.26.0
typeguard==2.13.3
typing_extensions==4.3.0
urllib3==1.26.12
virtualenv==20.16.5
webencodings==0.5.1
wrapt==1.14.1

My repo is at https://github.com/demberto/PyFLP

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