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

• OS version and name: Fedora 34
• Poetry version: 1.2.0a2

Issue

If you install plugin from relative directory poetry failes with error that there is no such directory. E.g.
poetry plugin add ../my_plugin/dist/my_plugin-0.1.0-py3-none-any.whl
results with:
Directory ../my_plugin/dist/my_plugin-0.1.0-py3-none-any.whl does not exist

If I run plugin add giving absolute path poetry adds plugin successfully.