diff --git a/src/components/Lightbox/pager/ImagePager.tsx b/src/components/Lightbox/pager/ImagePager.tsx
index 2b9a135a17..455cb26bc5 100644
--- a/src/components/Lightbox/pager/ImagePager.tsx
+++ b/src/components/Lightbox/pager/ImagePager.tsx
@@ -253,6 +253,9 @@ function ImageView({
   const dismissSwipeTranslateY = useSharedValue(0)
   const isFlyingAway = useSharedValue(false)
 
+  // Hold the neighbor window at 0 until the open animation completes, so we
+  // only decode the active image during the most memory-constrained moment.
+  // Mirrors the orientation-unlock gate below.
   // Hold the neighbor window at 0 until the open animation completes, so we
   // only decode the active image during the most memory-constrained moment.
   // Mirrors the orientation-unlock gate below.
@@ -265,6 +268,14 @@ function ImageView({
     },
   )
 
+  // On a rotation remount openProgress is already 1, so the reaction above
+  // never sees a change; seed the flag directly for that case.
+  useEffect(() => {
+    if (openProgress.get() === 1) {
+      setHasFullyOpened(true)
+    }
+  }, [openProgress])
+
   const containerStyle = useAnimatedStyle(() => {
     if (openProgress.get() < 1) {
       return {