Export wrong dependencies when using optional=true

poetry.lock

[[package]]
category = "main"
description = "Atomic file writes."
marker = "sys_platform == \"win32\""
name = "atomicwrites"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "1.4.0"

[[package]]
category = "main"
description = "Classes Without Boilerplate"
name = "attrs"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "19.3.0"

[package.extras]
azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
docs = ["sphinx", "zope.interface"]
tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]

[[package]]
category = "main"
description = "Cross-platform colored terminal text."
marker = "sys_platform == \"win32\""
name = "colorama"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
version = "0.4.3"

[[package]]
category = "main"
description = "Code coverage measurement for Python"
name = "coverage"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
version = "5.1"

[package.extras]
toml = ["toml"]

[[package]]
category = "main"
description = "More routines for operating on iterables, beyond itertools"
name = "more-itertools"
optional = true
python-versions = ">=3.5"
version = "8.3.0"

[[package]]
category = "main"
description = "Core utilities for Python packages"
name = "packaging"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "20.4"

[package.dependencies]
pyparsing = ">=2.0.2"
six = "*"

[[package]]
category = "main"
description = "plugin and hook calling mechanisms for python"
name = "pluggy"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "0.13.1"

[package.extras]
dev = ["pre-commit", "tox"]

[[package]]
category = "main"
description = "library with cross-python path, ini-parsing, io, code, log facilities"
name = "py"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "1.8.1"

[[package]]
category = "main"
description = "Python parsing module"
name = "pyparsing"
optional = true
python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
version = "2.4.7"

[[package]]
category = "main"
description = "pytest: simple powerful testing with Python"
name = "pytest"
optional = true
python-versions = ">=3.5"
version = "5.4.2"

[package.dependencies]
atomicwrites = ">=1.0"
attrs = ">=17.4.0"
colorama = "*"
more-itertools = ">=4.0.0"
packaging = "*"
pluggy = ">=0.12,<1.0"
py = ">=1.5.0"
wcwidth = "*"

[package.extras]
checkqa-mypy = ["mypy (v0.761)"]
testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]

[[package]]
category = "main"
description = "Pytest plugin for measuring coverage."
name = "pytest-cov"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
version = "2.8.1"

[package.dependencies]
coverage = ">=4.4"
pytest = ">=3.6"

[package.extras]
testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]

[[package]]
category = "main"
description = "Python 2 and 3 compatibility utilities"
name = "six"
optional = true
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
version = "1.14.0"

[[package]]
category = "main"
description = "Measures number of Terminal column cells of wide-character codes"
name = "wcwidth"
optional = true
python-versions = "*"
version = "0.1.9"

[extras]
dev = ["pytest-cov"]

[metadata]
content-hash = "0960b9e05e1e02200ad6d290d5f91cf4f4c1ac6d85c02554c57161b496379589"
python-versions = "^3.8"

[metadata.files]
atomicwrites = [
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attrs = [
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]
colorama = [
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    {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
]
coverage = [
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    {file = "coverage-5.1-cp36-cp36m-macosx_10_13_x86_64.whl", hash = "sha256:2d27a3f742c98e5c6b461ee6ef7287400a1956c11421eb574d843d9ec1f772f0"},
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    {file = "coverage-5.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:6402bd2fdedabbdb63a316308142597534ea8e1895f4e7d8bf7476c5e8751fef"},
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    {file = "coverage-5.1-cp39-cp39-win32.whl", hash = "sha256:a82b92b04a23d3c8a581fc049228bafde988abacba397d57ce95fe95e0338ab4"},
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    {file = "coverage-5.1.tar.gz", hash = "sha256:f90bfc4ad18450c80b024036eaf91e4a246ae287701aaa88eaebebf150868052"},
]
more-itertools = [
    {file = "more-itertools-8.3.0.tar.gz", hash = "sha256:558bb897a2232f5e4f8e2399089e35aecb746e1f9191b6584a151647e89267be"},
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]
packaging = [
    {file = "packaging-20.4-py2.py3-none-any.whl", hash = "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"},
    {file = "packaging-20.4.tar.gz", hash = "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8"},
]
pluggy = [
    {file = "pluggy-0.13.1-py2.py3-none-any.whl", hash = "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"},
    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
]
py = [
    {file = "py-1.8.1-py2.py3-none-any.whl", hash = "sha256:c20fdd83a5dbc0af9efd622bee9a5564e278f6380fffcacc43ba6f43db2813b0"},
    {file = "py-1.8.1.tar.gz", hash = "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa"},
]
pyparsing = [
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]
pytest = [
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]
pytest-cov = [
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    {file = "pytest_cov-2.8.1-py2.py3-none-any.whl", hash = "sha256:cdbdef4f870408ebdbfeb44e63e07eb18bb4619fae852f6e760645fa36172626"},
]
six = [
    {file = "six-1.14.0-py2.py3-none-any.whl", hash = "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"},
    {file = "six-1.14.0.tar.gz", hash = "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a"},
]
wcwidth = [
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]

pyproject.toml

[tool.poetry]
name = "tmp"
version = "0.1.0"
description = ""
authors = ["Your Name <you@example.com>"]

[tool.poetry.dependencies]
python = "^3.8"
pytest-cov = {version = "^2.8.1", optional = true}

[tool.poetry.dev-dependencies]
coverage = "^5.0.3"

[tool.poetry.extras]
dev = ["pytest-cov"]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"