pipenv: pipenv install -e . fails due to dependency resolution for packages installed through direct URL

Issue description

The title may be a bit confusing, thus I hope description will be clearer.

My packages section of Pipfile is as follows:

[packages]
prometheus-client = "*"
uberlogging = {file = "https://github.com/haizaar/uberlogging/archive/v0.0.2.tar.gz"}
private_pkg = {file = "https://${GITHUB_RO_TOKEN}:@github.com/Org/private_pkg/archive/v0.1.0.tar.gz"}

pipenv install passes fine, but then I try to do pipenv install --dev -e . with the following setup.py:

from setuptools import find_packages, setup

setup(
    name="foo",
    version="0.0.1",
    url="https://github.com/...",
    packages=find_packages(),
    install_requires=(
        "prometheus-client",
        "uberlogging",
        "private_pkg",
    )
)

it fails with Could not find a version that matches private_pkg, though private_pkg is listed in the satisfied requirements below. pip install -e . works just fine in pipenv’s venv and the resulting installation is functional. Bug?

$ pipenv install --dev -e .
Installing -e .…
Obtaining file:///home/haizaar/dev/healthshield/channeler
Requirement already satisfied, skipping upgrade: prometheus-client in /home/.../lib/python3.6/site-packages (from foo==0.0.1) (0.4.2)
Requirement already satisfied, skipping upgrade: uberlogging in /home/.../lib/python3.6/site-packages (from foo==0.0.1) (0.0.2)
Requirement already satisfied, skipping upgrade: private_pkg in /home/.../lib/python3.6/site-packages (from foo==0.0.1) (0.1.0)
Requirement already satisfied, skipping upgrade: python-json-logger in /home/.../lib/python3.6/site-packages (from uberlogging->foo==0.0.1) (0.1.9)
Requirement already satisfied, skipping upgrade: humanfriendly in /home/.../lib/python3.6/site-packages (from uberlogging->foo==0.0.1) (4.17)
Requirement already satisfied, skipping upgrade: structlog in /home/.../lib/python3.6/site-packages (from uberlogging->foo==0.0.1) (18.2.0)
Requirement already satisfied, skipping upgrade: coloredlogs in /home/.../lib/python3.6/site-packages (from uberlogging->foo==0.0.1) (10.0)
Requirement already satisfied, skipping upgrade: pyyaml in /home/.../lib/python3.6/site-packages (from private_pkg->foo==0.0.1) (3.13)
Requirement already satisfied, skipping upgrade: configmanager in /home/.../lib/python3.6/site-packages (from private_pkg->foo==0.0.1) (1.34.1)
Requirement already satisfied, skipping upgrade: setuptools in /home/.../lib/python3.6/site-packages (from python-json-logger->uberlogging->foo==0.0.1) (40.5.0)
Requirement already satisfied, skipping upgrade: six in /home/.../lib/python3.6/site-packages (from structlog->uberlogging->foo==0.0.1) (1.11.0)
Requirement already satisfied, skipping upgrade: configparser==3.5.0 in /home/.../lib/python3.6/site-packages (from configmanager->private_pkg->foo==0.0.1) (3.5.0)
Requirement already satisfied, skipping upgrade: future==0.16.0 in /home/.../lib/python3.6/site-packages (from configmanager->private_pkg->foo==0.0.1) (0.16.0)
Requirement already satisfied, skipping upgrade: hookery==1.4.0 in /home/.../lib/python3.6/site-packages (from configmanager->private_pkg->foo==0.0.1) (1.4.0)
Requirement already satisfied, skipping upgrade: funcsigs in /home/.../lib/python3.6/site-packages (from hookery==1.4.0->configmanager->private_pkg->foo==0.0.1) (1.0.2)
Installing collected packages: foo
  Found existing installation: foo 0.0.1
    Uninstalling foo-0.0.1:
      Successfully uninstalled foo-0.0.1
  Running setup.py develop for foo
Successfully installed foo

Adding foo to Pipfile's [dev-packages]…
Pipfile.lock (68f562) out of date, updating to (4f417c)…
Locking [dev-packages] dependencies…

Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  First try clearing your dependency cache with $ pipenv lock --clear, then try the original command again.
 Alternatively, you can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
Could not find a version that matches private_pkg
No versions found
Was https://pypi.org/simple reachable?

{'implementation_name': 'cpython',
 'implementation_version': '3.6.6',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.15.0-36-generic',
 'platform_system': 'Linux',
 'platform_version': '#39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018',
 'python_full_version': '3.6.6',
 'python_version': '3.6',
 'sys_platform': 'linux'}

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
prometheus-client = "*"
uberlogging = {file = "https://github.com/haizaar/uberlogging/archive/v0.0.2.tar.gz"}
private_pkg = {file = "https://${GITHUB_RO_TOKEN}:@github.com/Org/private_pkg/archive/v0.1.0.tar.gz"}

[dev-packages]
medium = {editable = true, path = "."}

[requires]
python_version = "3.6"

{
    "_meta": {
        "hash": {
            "sha256": "ae2ceeae45ac82d25d2563ac6b7d421babd5dda5437a4f0c35fddc78be4f417c"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.6"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "private_pkg: {
            "file": "https://${GITHUB_RO_TOKEN}:@github.com/Org/private_pkg/archive/v0.1.0.tar.gz"
        },
        "prometheus-client": {
            "hashes": [
                "sha256:046cb4fffe75e55ff0e6dfd18e2ea16e54d86cc330f369bebcc683475c8b68a9"
            ],
            "index": "pypi",
            "version": "==0.4.2"
        },
        "uberlogging": {
            "file": "https://github.com/haizaar/uberlogging/archive/v0.0.2.tar.gz"
        }
    },
    "develop": {}
}