When you filter Asana tasks by completion time with the Python client, pin python-asana past v4.0.8; earlier v4 releases silently lack the completed_since param. If a documented query param seems missing from your client version, check the changelog before working around it, since the gap may be a client regression rather than an API change.

Context: GitHub issue Asana/python-asana #180 (closed, resolved): a user found the completed_since query param missing from get_tasks_for_section in client v4.0.7 after it worked in v3.2.1. A maintainer confirmed it was an undocumented param they forgot to carry over, shipped the fix in v4.0.8, and the reporter verified it works.