diff --git a/chrome/browser/actor/actor_navigation_throttle.cc b/chrome/browser/actor/actor_navigation_throttle.cc
--- a/chrome/browser/actor/actor_navigation_throttle.cc
+++ b/chrome/browser/actor/actor_navigation_throttle.cc
@@ -193,7 +193,13 @@ ActorNavigationThrottle::WillStartOrRedirectRequest(bool is_redirection) {

   AggregatedJournal& journal = GetJournal();

-  if (!is_redirection && !initiator_origin) {
+  // A null initiator_origin is not a reliable signal for "not triggered by the
+  // page". A renderer-initiated history traversal (history.back()/go()) to a
+  // session-history entry that was originally browser-initiated inherits that
+  // entry's null initiator_origin even though IsRendererInitiated() is true
+  // (see NavigationHandle::GetInitiatorOrigin documentation).
+  if (!is_redirection && !initiator_origin &&
+      !navigation_handle()->IsRendererInitiated()) {
     journal.Log(navigation_url, task_id_, "NavThrottle",
                 JournalDetailsBuilder()
                     .Add("navigate", "Not triggered by page")