hatchling 1.32.0 breaks install for repos with readme outside of project dir

The change #2354 shipped in hatchling 1.32.0 was breaking for our monorepo fgcz/bfabricPy, since we shared the README.md for two packages including it with readme = "../README.md" in pyproject.toml. We did not have a version pin on the build backend (but even if I had it would probably have been semver, altho maybe in the future I will use an exact version pin).

In the past this was working fine and builds have been pushed to PyPI.

Of course they now both have a separate README.md, so there's some positive outcome from this even, but I just thought I'd let you know in case it's affecting more projects in the ecosystem.