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The Phase 4 random harness found F113: undo of detaching an overridden copy restored its touched groups before shape-ref. The copy-only setter therefore dropped those groups. Append the touched and remote-sync undo operations after restoring the shape's attributes. The focused regression failed first and now passes. Common JVM/JS and all 1499 frontend tests pass. Common lint and targeted format checks pass. The frontend test build used shadow-cljs directly because Cargo's cache permissions blocked the wrapper's unrelated WASM rebuild. Benchmark lower-quantile ratios against Phase 1e: main 10/100/1000 copies: 0.46/0.52/0.53; three levels: 0.54; chain: 0.47; library: 0.58; many shapes: 0.68; switch: 0.64. No regression flag. AI-assisted-by: GPT-6