Problem configuring custom rules in pre-commit.

Hello, I have written some custom rules and have them working when running fixit directly,

but they are not run by the pre-commit. The setup is that the python code is in a `backend/` directory, including the `pyproject.toml` configuring fixit, and the directory containing the custom rules.

I tried copying the `[tool.fixit]` in a `pyproject.toml` file at the root of the repository, but it's not working either.

using versions:
- fixit 2.1.0
- pre-commit: 3.6.2

Edit: it seems actually that the problem is that the `fixit fix --automatic` command does not return a non-zero code if there are still changes, the `fixit lint` actually works for this. But I'd prefer to run `fixit fix` in pre-commit.