1.33: sphinx warnings reference target not found

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

+ /usr/bin/sphinx-build -n -T -b man doc build/sphinx/man
Running Sphinx v6.2.1
making output directory... done
building [mo]: targets for 0 po files that are out of date
writing output...
building [man]: all manpages
updating environment: [new config] 4 added, 0 changed, 0 removed
reading sources... [100%] tutorial
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... python-json-patch.3 { tutorial mod-jsonpatch commandline } /home/tkloczko/rpmbuild/BUILD/python-json-patch-1.33/jsonpatch.py:docstring of jsonpatch.apply_patch:9: WARNING: py:const reference target not found: True
/home/tkloczko/rpmbuild/BUILD/python-json-patch-1.33/jsonpatch.py:docstring of jsonpatch.apply_patch:: WARNING: py:class reference target not found: JsonPointer
/home/tkloczko/rpmbuild/BUILD/python-json-patch-1.33/jsonpatch.py:docstring of jsonpatch.make_patch:1: WARNING: py:meth reference target not found: JsonPatch.from_diff
/home/tkloczko/rpmbuild/BUILD/python-json-patch-1.33/jsonpatch.py:docstring of jsonpatch.make_patch:: WARNING: py:class reference target not found: JsonPointer
done
build succeeded, 4 warnings.

You can peak on fixes that kind of issues in other projects
RDFLib/rdflib-sqlalchemy#95
RDFLib/rdflib#2036
click-contrib/sphinx-click@abc31069
frostming/unearth#14
jaraco/cssutils#21
latchset/jwcrypto#289
latchset/jwcrypto#289
pypa/distlib@98b9b89f
pywbem/pywbem#2895
sissaschool/elementpath@bf869d9e
sissaschool/xmlschema@42ea98f2
sqlalchemy/sqlalchemy@5e88e6e8

[stefankoegl]

I don't quite understand why sphinx does not find the references. Any idea?