An organization chart is a picture of accountability. It is not a picture of work.
Work moves sideways. It crosses the lines that the chart draws most confidently, and it does so at exactly the moments when clarity matters most: a launch, an escalation, a decision that cannot be reopened later without cost.
Why the seams stay unmanaged
Nobody owns an arrow. Ownership is assigned to boxes, and the incentives follow ownership. So each box optimizes what it can see, and the space between boxes accumulates a cost that no single leader is accountable for reducing.
A better question
Instead of asking who owns this, ask what it costs to move work across this boundary; in waiting, in translation, in repair. The answer is usually available within a week of asking, and it is usually larger than anyone expected.
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