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Addresses the problem of ghost avatars. The problem was child-agents sending data. Due to symmetry reasons, I considered that wrong. Whenever an avatar A1 in region R1 looks at avatar A2 in adjacent region R2, we have two possibilities to communicate: A2-root sends to A1-child (both in region R2), or A2-child sends to A1-root (both in region R1). Currently, the children send data in some cases, and I guess the viewer gets puzzled about that and switches the child to root as consequence (at least partly), so it becomes visible.