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Compositions with external sub-compositions (like apple-presentation with 7 slides) load child compositions via fetch(). The root GSAP timeline is only bound after all external compositions finish loading, but the TransportClock duration was only set during initial setup. When bindRootTimelineIfAvailable runs after the external compositions load, it captures the root timeline but never updates the clock. player.getDuration() continues returning 0, so the player's probe interval never fires the 'ready' event, and the Studio shows "Loading composition" indefinitely. Now bindRootTimelineIfAvailable updates clock.setDuration when the root timeline is late-bound. Guarded with try/catch for the early call site where clock is not yet initialized (temporal dead zone). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>