OFS-20798 is a Task (child of OFS-20795 Epic), so tests nested
under it must be Sub-tasks, not Tasks — Task cannot parent Task.
Logic:
- parent_ticket_override (campaign) → Sub-task (unchanged)
- standalone_parent configured and differs from general parent → Sub-task
- only general parent (Epic) → Task
This fixes 'Please select valid parent issue' for standalone tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>