diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelinePresenter.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelinePresenter.kt
index 3ec31b1a99..e8e932b48b 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelinePresenter.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelinePresenter.kt
@@ -333,7 +333,12 @@ class TimelinePresenter(
             }
         }
 
-        LaunchedEffect(timelineItems.size, focusRequestState.value) {
+        // Keyed on the full [timelineItems] reference (not just .size) so we re-resolve the index
+        // when a focused timeline loads with the same item count as the window it replaced — e.g.
+        // jumping to an out-of-window read marker in a busy room, where both windows fill to the
+        // same page size. With .size as the key the effect wouldn't re-run, the focused event's
+        // index would stay unresolved, and the scroll would never fire until a second tap.
+        LaunchedEffect(timelineItems.map { it.identifier() }, focusRequestState.value) {
             val currentFocusRequestState = focusRequestState.value
             if (currentFocusRequestState is FocusRequestState.Success && !currentFocusRequestState.rendered) {
                 val eventId = currentFocusRequestState.eventId