Quick answer
Swabbies and fetchers serve different settlement functions. Verify the current population tier, assignment controls and route before treating a stalled building as a production shortage.
What the reviewed sources establish
- The official wiki documents population and logistics systems.
- Different population types have distinct settlement jobs.
- Transport can fail even when a good exists.
Use this current-build checklist
- Select the affected building or route.
- Inspect required worker type and staffing.
- Confirm the worker can reach the assignment.
- Trace pickup, storage and delivery.
- Change one constraint and observe a full cycle.
Keep the answer current
- Do not confuse no workers with no input.
- Retest old staffing advice after patches.