skip and extend_skip being ignore

[LondonAppDev]

I'm using isort 5.10.1 and I'm trying to exclude additional virtual environment directories using the project config.

In my project, I have a myproject.toml file which contains the following for isort:

[tool.isort]
profile = "black"
src_paths = ["src1", "src2"]
extend_skip = [".env", "env"]

If I run isort . from the root of my project, it will sort dependencies from all modules inside my virtual environment which sits in a directory called env in my project root.

If I call the virtual environment venv (which is one of the default skip values mentioned in the docs here), then this does appear to be excluded.

It looks like items added to extend_skip are not being skipped.