Multi-worker render still differs from -w 1 on 0.9.15 with a set and a tween inside a running tween (#6707 pattern) #7223

Describe the bug

A multi-worker local render still differs from a -w 1 render on 0.9.15 when a set and a second tween land while a tween on the same property is running. This is the pattern #6707 describes. The output is identical to 0.8.214's, so the replay from #6707 doesn't seem to apply here. The render does pass fps: with HYPERFRAMES_DEBUG=1 each worker logs render runtime fps {"canonicalFps":30,"source":"render-options",...}.

Minimal reproduction

index.html, with gsap.min.js 3.15.0 beside it:

<!doctype html>
<html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#010101} #root{position:relative;width:1080px;height:1920px;overflow:hidden}
#box{position:absolute;left:340px;top:760px;width:400px;height:400px;background:#AFE607;transform-origin:50% 50%}</style></head>
<body><div id="root" data-composition-id="root" data-start="0" data-duration="3" data-width="1080" data-height="1920"><div id="box"></div></div>
<script src="gsap.min.js"></script>
<script>
  const tl = gsap.timeline({ paused: true });
  tl.to('#box', { scale: 1.6, duration: 1, ease: 'none' }, 0);   // zoom punch, 0–1 s
  tl.set('#box', { scale: 1.0 }, 0.5);                            // a cut sets the zoom while it runs
  tl.to('#box', { scale: 2, duration: 2, ease: 'none' }, 0.55);   // a slow move from wherever the zoom is
  window.__timelines = { root: tl };
</script></body></html>

Steps to reproduce

1. hyperframes render . -q delivery -w 1 -o w1.mp4
2. hyperframes render . -q delivery -w 8 -o w8.mp4
3. Measure the box width on row y = 960 in each frame (lime pixels ÷ 400 = scale).

Expected behavior

w8.mp4 matches w1.mp4 on every frame.

Actual behavior

59 of 90 frames differ (frames 18–77). With 8 workers the box jumps back and forth with period 8:

0.8.214 gives the same numbers in both columns. The -w 1 renders from 0.8.214 and 0.9.15 match each other (≥ 63 dB PSNR).

Environment

• hyperframes 0.9.15 (CLI, local render), also 0.8.214 for comparison
• Linux x64, Node v24.20.0, 8 cores
• GSAP 3.15.0, 30 fps

Additional context

hyperframes lint 0.9.15 flags this composition with two overlapping_gsap_tweens warnings: the set at 0.50 s fires inside the 0–1 s tween, and the tweens overlap on scale between 0.55 s and 1.00 s. So the lint sees the overlap, but the multi-worker render doesn't replay it.