Removal of few packages

[rkoystart]

The poetry version currently i am using is 1.1.6 and python version is 3.8.3.
I have multiple projects and each project has a pyproject.toml and a corresponding lock file.

During deployment purpose in few cases, i want to install a couple of projects in the same environment. But by doing so i could see that few packages are being removed.
For example say i have project1 and project 2 and its corresponding pyproject1.toml and pyproject2.toml. I create a new conda env and run the command poetry install which install all the dependencies in pyproject1.toml and then now again run the command poetry install which install pyproject2.toml, but removes certain packages which is necessary for the project1.

Can i know what is the reason for removal of those packages and is this the expected behaviour.
If yes is there any solution to this kind of problem.

[radoering]

Poetry 1.1.6 is quite old and not supported anymore. There have been lots of bug fixes in the meantime. Can you reproduce your issue with a current version of poetry? In current versions packages should be only removed when you call poetry install --sync. Without --sync packages are kept even if they are not required by the current project.