hi Chris, known issues are reported in the following page:
https://experienceleague.adobe.com/en/docs/workfront-known-issues/issues/overview
Your problem isn't listed.
Having replicated the same behavior in my environment, and checked all my schedules (project schedule, user schedule, whether or not it's a timezone issue, and resource management schedule), I would probably say you're well within your rights to submit a case to Support.