"Created fixture names are not unique, please report" when duplicate fixture reference is provided in a pytest.param

[smarie]

import pytest
from pytest_cases import fixture, parametrize, fixture_ref

@fixture
def b():
    print("b")
    return "b"

@parametrize("fixture", [fixture_ref(b),
                         pytest.param(fixture_ref(b))
                         ])
def test(fixture):
    print("Test ran fixure %s" % fixture)

raises AssertionError: Created fixture names are not unique, please report