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The two rAF loops (fixture sampler + hook) interleave in an order we don't control, and a late WebKit RO appends a frame after the reflow paints. A tight [prev, this) window mis-labeled all 4 fast-corpus survivors UNATTRIBUTED when the attempt had appended one frame late. Widening to [prev, next) resolves them to their true class. Fast jitter corpus, WebKit: all 4 survivors classify SKIP (fired=false, signedShift=0.0, dScroll=0.0) — the momentum-skip gate suppressed the write on a coalesced-momentum still frame, so the reflow renders uncorrected. Neither GROW (absorption) nor SHRINK (Max's band): the lever is the skip gate. Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>