Work does not break while someone is doing their part. It breaks after. In the space between
one person finishing and the next person starting. That gap has no place to go except back to
the owner.
So it comes back. Every time.
This is not a people problem. It is a path problem.
Big companies solved this the same way, they designed the movement between workstations
as deliberately as the workstations themselves. Each step defined so that the next person
knows exactly when to start, what to do, and where the work goes next.