From d10b2f4dedc176e0b92001d284cddd87924e961b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20=C3=81ngel?= <miguel.sierra@heygen.com>
Date: Mon, 18 May 2026 05:24:33 -0400
Subject: [PATCH] fix(core): only rebind timelines when late arrivals were
 actually detected
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The late-bind polling was unconditionally rebinding on its first
check even when all timelines were already present, causing visual
regressions across style-prod tests. Now tracks sawMissing flag —
only rebinds if the poll previously detected missing timelines that
subsequently appeared. Compositions with synchronous timeline
registration exit the poll immediately with no side effects.
---
 packages/core/src/runtime/init.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/runtime/init.ts b/packages/core/src/runtime/init.ts
index b0f83e0ff..12007ed3c 100644
--- a/packages/core/src/runtime/init.ts
+++ b/packages/core/src/runtime/init.ts
@@ -1471,6 +1471,7 @@ export function initSandboxRuntimeModular(): void {
         postState(true);
 
         let lateBindChecks = 0;
+        let sawMissing = false;
         const lateBindInterval = setInterval(() => {
           if (++lateBindChecks > 50) {
             clearInterval(lateBindInterval);
@@ -1482,10 +1483,11 @@ export function initSandboxRuntimeModular(): void {
             const id = hosts[i].getAttribute("data-composition-id");
             if (id && !timelines[id]) {
               allBound = false;
+              sawMissing = true;
               break;
             }
           }
-          if (allBound && lateBindChecks > 1) {
+          if (allBound && !sawMissing) {
             clearInterval(lateBindInterval);
             return;
           }