Only increment the history list offset if we are not replacing the current item.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index b9c3fc7b761494e886b4fb26ddbaa5bc0b7d4ead..06ccc58a40cf531fc86a9987f39f66b508bc1cdc 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2531,7 +2531,8 @@ void RenderFrameImpl::didCommitProvisionalLoad(
     // UpdateSessionHistory and update page_id_ even in this case, so that
     // the current entry gets a state update and so that we don't send a
     // state update to the wrong entry when we swap back in.
-    if (GetLoadingUrl() != GURL(kSwappedOutURL)) {
+    if (GetLoadingUrl() != GURL(kSwappedOutURL) &&
+        !navigation_state->should_replace_current_entry()) {
       // Advance our offset in session history, applying the length limit.
       // There is now no forward history.
       render_view_->history_list_offset_++;