The latest Poetry (1.8.2) gives this warning:

Installing the current project: dts (0.1.0)
Warning: The current project could not be installed: No file/folder found for
package dts
If you do not want to install the current project use --no-root.
If you want to use Poetry only for dependency management but not for packaging,
you can disable package mode by setting package-mode = false in your
pyproject.toml file.
In a future version of Poetry this warning will become an error!