Describe the bug

In some circumstances footnote mark is rendered as ? and there is no hyperlink

How to Reproduce

file index.rst:

Test
====

Explicitly numbered footnotes
-----------------------------

First reference to first footnote [1]_ 

First reference to second footnote [2]_

Second reference to first footnote [1]_

Second reference to second footnote [2]_


.. rubric:: Footnotes

.. [1] A first footnote

.. [2] A second footnote

then make latexpdf.

Expected behavior

Footnotes are rendered correctly

Your project

See above code

Screenshots

OS

Mac

Python version

3.8.7 (CPython)

Sphinx version

4.4.0 and current 4.x (v4.5.0+/4ba056870)

Sphinx extensions

No response

Extra tools

No response

Additional context

No response