Somewhat non-deterministic erroneous errors in pyright

[mtanida]

We are seeing strange, somewhat non-deterministic errors in pyright. I say "somewhat non-deterministic" because we don't always see the error, but when we do, it usually complains about the same erroneous thing.

For example, we often get this error:

path/to/util.py:8:8 - error: Import "urllib.parse" is not accessed (reportUnusedImport)

Despite the fact that is IS actually accessed in the module:

import urllib.parse

....

    parsed_url = urllib.parse.urlparse(url)

We are running pyright 1.1.405 in CI, and we are getting the erroneous pyright errors quite frequently. I tell my developers to just rerun the job and it will probably pass in the 2nd attempt... but this is not ideal. What's going on?