Packages not finding libraries

Description

I really don't know how to describe what's going on, but libraries in the site-packages folder are not being found when using poetry 2.1

Using a new folder:
poetry add torch transformers ipython -- assuming the pyproject.toml points to the correct directory for Pytorch

Using ipython:

from transformers import AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("distilbert/distilbert-base-uncased")

results in the following error:
ImportError: libcudnn.so.9: cannot open shared object file: No such file or directory

but the file is definitely in .venv/lib/python3.13/site-packages/nvidia/cudnn/lib/libcudnn.so.9.

Whereas if I use the equivalent commands with pip in a different new folder

source .venv/bin/activate
pip install torch  --index-url https://download.pytorch.org/whl/cu126
pip install transformers ipython

and execute the Tokenizer commands in ipython, all is well.

What could be going on here?

Workarounds

I've switched to pip.

Poetry Installation Method

pipx

Operating System

Fedora 41

Poetry Version

Poetry (version 2.1.0)

Poetry Configuration

cache-dir = "/home/<removed>/.cache/pypoetry"
data-dir = "/home/<removed>/.local/share/pypoetry"
installer.max-workers = null
installer.no-binary = null
installer.only-binary = null
installer.parallel = true
installer.re-resolve = true
keyring.enabled = true
python.installation-dir = "{data-dir}/python"  # /home/<removed>/.local/share/pypoetry/python
repositories.torch.url = "https://download.pytorch.org/whl/cu126"
requests.max-retries = 0
solver.lazy-wheel = true
system-git-client = false
virtualenvs.create = true
virtualenvs.in-project = true
virtualenvs.options.always-copy = false
virtualenvs.options.no-pip = false
virtualenvs.options.system-site-packages = false
virtualenvs.path = "{cache-dir}/virtualenvs"  # /home/<removed>/.cache/pypoetry/virtualenvs
virtualenvs.prompt = "{project_name}-py{python_version}"
virtualenvs.use-poetry-python = false

Python Sysconfig

Paste the output of 'python -m sysconfig', over this line.

Example pyproject.toml

Poetry Runtime Logs

Paste the output of 'poetry -vvv <command>', over this line.

Start by reproducing the Poetry commands and the equivalent pip commands in fresh folders, then compare the resulting environments. Inspect the provided Poetry configuration and the empty example pyproject.toml, focusing on why libcudnn.so.9 is not found from the Poetry environment. Done means identifying the environment or dependency-resolution difference and documenting a verified fix or clear reproduction details.