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The field dates from the first file drop commit, when the sender was to advertise the port its receiver had bound. Pinning the tunnel-side port replaced that: the port is fixed, a receiver that cannot bind it redirects the well-known port to whatever it got, and the sender dials the constant without negotiating. Nothing ever read the field. It never reached main, so field number 12 goes back to being free rather than needing a reserved slot. Regenerated with the pinned protoc 3.21.12 and protoc-gen-go 1.26.0, so the diff is the field and the descriptor bytes behind it.