Package scoped fixture will not execute teardown

I am experiencing a weird issue:
'package' scoped fixture will not execute teardown after last test in package is completed if afformentioned fixture is defined outside of package

Environment

~ python --version
Python 3.8.5

~ pip freeze
allure-pytest==2.8.24
allure-python-commons==2.8.24
assertpy==1.1
attrdict==2.0.1
attrs==20.3.0
bcrypt==3.2.0
cffi==1.14.4
cryptography==3.2.1
cycler==0.10.0
future==0.18.2
iniconfig==1.1.1
kiwisolver==1.3.1
matplotlib==3.3.3
mininet==2.3.0.dev6
more-itertools==8.6.0
numpy==1.19.4
packaging==20.7
paramiko==2.7.2
pexpect==4.8.0
pexpect-serial==0.1.0
Pillow==8.0.1
pluggy==0.13.1
ptyprocess==0.6.0
py==1.9.0
pycparser==2.20
PyNaCl==1.4.0
pyparsing==2.4.7
Pypubsub==4.0.3
pyserial==3.5
pytest==6.2.1
pytest-dependency==0.5.1
pytest-logger==0.5.1
pytest-sugar==0.9.4
python-dateutil==2.8.1
PyYAML==5.3.1
singleton-decorator==1.0.0
six==1.15.0
termcolor==1.1.0
toml==0.10.2
wcwidth==0.2.5

~ uname -a 
5.4.0-58-generic #64-Ubuntu SMP Wed Dec 9 08:16:25 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Example to reproduce

~ tree test
test
├── __init__.py
├── conftest.py
├── sub1
│   └── __init__.py
│   └── test_foo.py
└── sub2
    └── __init__.py
    └── test_bar.py
2 directories, 3 files

~ cat test/conftest.py
import pytest

@pytest.fixture(scope='package')
def package_scoped():
    print('setup')
    yield
    print('teardown')

~ cat test/sub1/test_foo.py
def test_foo(package_scoped): pass

~ cat test/sub2/test_bar.py
def test_foo(package_scoped): pass

Result

~ pytest test --setup-plan -p no:sugar
=============== test session starts ===============
platform linux -- Python 3.8.5, pytest-6.2.1, py-1.9.0, pluggy-0.13.1
rootdir: /home/hdemchenko/git/uns
plugins: dependency-0.5.1, logger-0.5.1, allure-pytest-2.8.24
collected 2 items

test/sub1/test_foo.py
  SETUP    P package_scoped
        test/sub1/test_foo.py::test_foo (fixtures used: package_scoped)
test/sub2/test_bar.py
        test/sub2/test_bar.py::test_foo (fixtures used: package_scoped)
  TEARDOWN P package_scoped

=============== no tests ran in 0.01s ===============

If I create two conftest files in each package with the package scoped fixture I intend to use then I can see it behaving as I was expecting.
Example:

~ mv test/conftest.py test/sub1/
~ cp test/sub1/conftest.py test/sub2/
~ pytest test --setup-plan -p no:sugar
=============== test session starts ===============
platform linux -- Python 3.8.5, pytest-6.2.1, py-1.9.0, pluggy-0.13.1
rootdir: /home/hdemchenko/git/uns
plugins: dependency-0.5.1, logger-0.5.1, allure-pytest-2.8.24
collected 2 items

test/sub1/test_foo.py
  SETUP    P package_scoped
        test/sub1/test_foo.py::test_foo (fixtures used: package_scoped)
  TEARDOWN P package_scoped
test/sub2/test_bar.py
  SETUP    P package_scoped
        test/sub2/test_bar.py::test_foo (fixtures used: package_scoped)
  TEARDOWN P package_scoped

=============== no tests ran in 0.01s ===============

Start with test/conftest.py and the reproducer files test/sub1/test_foo.py and test/sub2/test_bar.py. Run pytest test --setup-plan -p no:sugar and trace package-scoped fixture setup and teardown when the fixture is defined above both packages. Done means teardown occurs after the last test in the package scope, matching the behavior shown when each package has its own conftest.py.