For 28 minutes on 2026-10-08 every send to the control-node was refused for a new bus build that only a person's bus upgrade moves, and no condition said so: the refusal lived only in each walk's note, and S3 would have called it lateness after half an hour, in words that named neither the bus nor the verb. - Row S17, bus.<module>.step-waiting: raised on the first watchdog tick after a walk's send is refused for the bus, for the operator, naming the machines, what waits, the bus build from and to, since when and mesh-controller.bus upgrade. It clears once the bus's machine runs the build the mesh holds. - S3 leaves out a walk held only by the bus's step. - A change that builds the bus says in its delivery plan and summary (which mesh/merge-gate carries) that merging it needs a person's bus upgrade, and that nothing else reaches its machine until then. - TestReplay336 fails on the commit before and passes on this one.