The sdist releases on PyPI contain files that aren't in the git repository:

ev.py
x.py
xx.py
xx2.py
xx3.py
y.py

Could you arrange for this not to happen? https://hatch.pypa.io/latest/plugins/builder/sdist/ suggests that ignoring them in git should work, but you could also use https://hatch.pypa.io/latest/config/build/#file-selection to explicitly include the files that should be shipped.