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> As a workaround, I had to uninstall pytest from the package manager and install it in the virtual environment. However, I would prefer to use the pytest from the package manager since it makes sense to me to install a package I use often globally instead of installing it in each virtual environment.

I'd say that wasn't the workaround, it was the solution. A python package from outside your venv does not know what's installed inside. To run pytest inside a venv, with the venv, you need to install it inside of it.