Poetry reads pypi dependencies' dependencies with epoch version as <empty>

[ashleysommer]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 20.04
• Poetry version: 1.2.0b1
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/ashleysommer/d995dfb27d9a70f8bacd645a6d46c8f7

Issue

Installing a package named "cylc-flow" with version "8.0rc2" from pypi.

The package has a dependency that looks like metomi-isodatetime>=1!2.0.2, <1!2.1.0

But poetry seems to resolve this dependency as <empty>.

Even pinning the version of metomi-isodatetime in my own pyproject.toml file doesn't help, see the attached gist for my sample pyproject.toml file.

Loading configuration file /home/me/.config/pypoetry/config.toml
Loading configuration file /home/me/CODE/Other/Cylc-test/poetry.toml
Using virtualenv: /home/me/CODE/Other/Cylc-test/.venv
Updating dependencies
Resolving dependencies...
   1: fact: my-test is 0.0.1
   1: derived: my-test
   1: fact: my-test depends on cylc-flow (8.0rc2)
   1: fact: my-test depends on metomi-isodatetime (1!2.0.2)
   1: selecting my-test (0.0.1)
   1: derived: metomi-isodatetime (==1!2.0.2)
   1: derived: cylc-flow (==8.0rc2)
PyPI: 1 packages found for metomi-isodatetime 1!2.0.2
PyPI: 1 packages found for cylc-flow 8.0rc2
   1: selecting metomi-isodatetime (1!2.0.2)
   1: fact: cylc-flow (8.0rc2) depends on aiofiles (>=0.7.0,<0.8.0)
   1: fact: cylc-flow (8.0rc2) depends on ansimarkup (>=1.0.0)
   1: fact: cylc-flow (8.0rc2) depends on async-timeout (>=3.0.0)
   1: fact: cylc-flow (8.0rc2) depends on colorama (>=0.4,<=1)
   1: fact: cylc-flow (8.0rc2) depends on graphene (>=2.1,<3)
   1: fact: cylc-flow (8.0rc2) depends on jinja2 (>=2.11.0,<2.12.0)
   1: fact: cylc-flow (8.0rc2) depends on metomi-isodatetime (<empty>)
   1: fact: cylc-flow (8.0rc2) depends on protobuf (>=3.19.0,<3.20.0)
   1: fact: cylc-flow (8.0rc2) depends on psutil (>=5.6.0)
   1: fact: cylc-flow (8.0rc2) depends on pyuv (>=1.4.0,<1.5.0)
   1: fact: cylc-flow (8.0rc2) depends on pyzmq (>=22.0.0,<23.0.0)
   1: fact: cylc-flow (8.0rc2) depends on setuptools (>=49)
   1: fact: cylc-flow (8.0rc2) depends on urwid (>=2.0.0,<3.0.0)
   1: fact: cylc-flow (8.0rc2) depends on markupsafe (<2.1)
   1: derived: markupsafe (<2.1)
   1: derived: urwid (>=2.0.0,<3.0.0)
   1: derived: setuptools (>=49)
   1: derived: pyzmq (>=22.0.0,<23.0.0)
   1: derived: pyuv (>=1.4.0,<1.5.0)
   1: derived: psutil (>=5.6.0)
   1: derived: protobuf (>=3.19.0,<3.20.0)
   1: conflict: cylc-flow (8.0rc2) depends on metomi-isodatetime (<empty>)
   1: ! cylc-flow (==8.0rc2) is satisfied by cylc-flow (==8.0rc2)
   1: ! which is caused by "my-test depends on cylc-flow (8.0rc2)"
   1: ! thus: metomi-isodatetime is required
   1: ! not metomi-isodatetime (<empty>) is satisfied by metomi-isodatetime (==1!2.0.2)
   1: ! which is caused by "my-test depends on metomi-isodatetime (1!2.0.2)"
   1: ! thus: version solving failed
   1: Version solving took 0.162 seconds.
   1: Tried 1 solutions.

I updated to poetry-core v1.1.0a7 because it said it supports PEP440 epoch versions, but didn't seem to help.
Also updated to poetry v1.2.0b1 to get latest poetry fixes, but again didn't help.

Related to #5030
Related to python-poetry/poetry-core#264

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