reportPrivateImportUsage when running in subdirectory

[mtanida]

We have a repository that uses a uv workspace. The workspace is defined at the root directory of the repository, and we have packages within the workspace in subdirectories.

A developer ran into a weird error where they were getting reportPrivateImportUsage errors when running pyright in a subdirectory (uv run pyright packageC). However, running pyright at the workspace root (uv run pyright) doesn't produce the error.

I'm simplifying to keep things simple, but consider the following 3 modules in 3 different packages:

packageA/foo.py:

class myclass:
   ...

packageB/bar.py

from packageA.foo import myclass

packageC/moo.py

from packageB.bar import myclass

Regardless of whether this is good practice or not (obviously not), when running uv run pyright at the workspace root, we get no errors. But if we run uv run pyright packageC, we get the reportPrivateImportUsage error for myclass. My devs want to understand why CI didn't catch it (because we run pyright at the workspace root). I still don't totally understand why we get different behaviors depending on whether we specify a subdirectory to pyright. Can I get an explanation? Thank you so much!