Has anyone successfully used pants with local prebuilt wheels? I have followed the guide for Local requirements using the option

[python-repos].find_links

like so

[python-repos]
# No one needs to change these values, as long as they can use the same shared location.
find_links = ["file://%(buildroot)s/prebuilt_wheels"]
path_mappings = ["WHEELS_DIR|%(buildroot)s/prebuilt_wheels"]

but couldn't get it working without actually rewriting the dependency's full path in the generated python lock file. BUILD file with full local path like below works fine.

python_requirement(
    name="django",
    # Use an absolute path to a .whl or sdist file.
    requirements=["Django @ file:///Users/pantsbuild/prebuilt_wheels/django-3.1.1-py3-none-any.whl"],
)

But BUILD file with

python_requirement(name="django", requirements=["django>=3.1,<3.2"])

was still using the pypi repository instead of the local wheels directory specified with env var in python-repos. Hack that I used to make it work was to generate the lockfile using the full path

file:///Users/pantsbuild/prebuilt_wheels/django-3.1.1-py3-none-any.whl

and then rewrite it in the locfile using the env var

WHEELS_DIR

What am I missing?