• 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: Docker python:3.9.2
• Poetry version: 1.1.5/1.1.6
• Link of a Gist with the contents of your pyproject.toml file: A repo to reproduce this bug: https://github.com/pdeszynski/poetry-fail-example

Issue

In case you have such dependencies: proj1 -> proj2 -> proj3 marked as develop, newest poetry (1.1.6) will not install proj3 dependencies whether previous release will handle that case. This occurs ONLY if poetry.lock is present.

To reproduce:

git clone https://github.com/pdeszynski/poetry-fail-example
cd poetry-fail-example
docker build -f Dockerfile-1.1.5 -t poetry-1.1.5 .
docker build -f Dockerfile-1.1.6 -t poetry-1.1.6 .

docker run --rm -it poetry-1.1.5 python proj1/proj1/__init__.py  # <- this will succeed
docker run --rm -it poetry-1.1.6 python proj1/proj1/__init__.py # <- this will fail with pydash missing error