not installed correctly with pypa's build

hi, i maintain a package for this project in nixpkgs (though i'm not very familiar with python) i'm trying to update it from v0.8 to v0.9 this mostly worked on our 23.05 channel (though there's two problems with the benchmarks) but when i tried to build again on the latest nixpkgs channel it fails to install the `rtoml` output i suspect this is due to nixpkgs having switched to using pypa's `build` instead of `pip` an incomplete and misnamed `lib/python3.10/site-packages/_rtoml` gets created but not the `site-packages/rtoml` i got on 23.05