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A GSAP keyframes tween resolves its inner timeline's ease ONCE, at build time, via the internal ease map. The composition inline script builds these tweens before the runtime registers the custom eases (hold/spring/wiggle/custom), so a custom container ease bakes the inner _ease to undefined; GSAP then throws _ease is not a function on the first render (masked as a cross-origin Script error) on composition load and every manual edit. Re-resolve each keyframes tween's inner ease during rebind, once the eases are registered.