Pypi package httpx cannot install extras

[T145]

I have the following entry:

[pypi-dependencies]
httpx = { version = "*", extras = ["cli", "http2", "brotli"] }

I then ran install, then pixi run httpx, and got this message:

The httpx command line client could not run because the required dependencies were not installed.
Make sure you've installed everything with: pip install 'httpx[cli]'

And get this error after running update:

 WARN The package `httpx==0.27.2` does not have an extra named `cli`
 WARN The package `httpx==0.27.2` does not have an extra named `brotli`
 WARN The package `httpx==0.27.2` does not have an extra named `http2`
Lock-file was already up-to-date

Is this an issue with Pixi, the package, or how I've configured it?