Error collecting test with --doctest-module

[ernestoarbitrio]

Given that pytest works perfectly with all my unit and integration tests, i'm facing a problem dough when trying to run doctests with this command:
pytest -svv tests/unit --doctest-modules
The error seems related to a fixture (custom) i normally use in my tests, so I got this error:

PytestWarning: Got ValueError('no NPY fixture found at /mypath/tests/fixtures/mask-arrays/--wrapped--.npy') when unwrapping <tests.fixtures.LazyNPYResponseLoader object at 0x12f144760>.  This is usually caused by a violation of Python's object protocol; see e.g. https://github.com/pytest-dev/pytest/issues/5080

and then

FAILED tests/unit/test_util.py - ValueError: no NPY fixture found at /mypath/tests/fixtures/mask-arrays/--wrapped--.npy

Obviously that fixture doesn't exists cause the --wrapped file is the one generated from the doctest.py module.

I wonder if someone can give me a hint or tell me if I'm doing something wrong 🤷🏽‍♂️
Thx