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In an inverse sync, when a copy child paired with a main child further along the main's children, compare-children asked whether the copy child was the main of the main child, with the arguments of ctk/is-main-of? reversed. The answer was always no, so the pair took the swapped callback, which does nothing in an inverse sync, and only the move ran: the overrides of that copy child never reached the main. The UI does not let a copy reorder its children, so it only showed when the order differed for another reason, such as the undo of a sync reorder. The inverse branch now asks synced-pair? with the main child first, as the direct branch does. Benchmark (lower quantile, ms; baseline / now / ratio): deepest-edit-through-three-levels 35.2 / 35.5 / 1.01 edit-through-a-chain-of-dependents 68.9 / 66.1 / 0.96 library-update-into-copies 83.1 / 77.0 / 0.93 main-edit-into-10-copies 1.8 / 1.6 / 0.92 main-edit-into-100-copies 15.4 / 16.2 / 1.05 main-edit-into-1000-copies 153.1 / 156.4 / 1.02 variant-switch-into-copies 32.1 / 28.3 / 0.88 AI-assisted-by: claude-opus-5-5 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>