diff --git a/src/pages/home/report/ReportActionsList.js b/src/pages/home/report/ReportActionsList.js
index 8e63f508f8ce..183665891929 100644
--- a/src/pages/home/report/ReportActionsList.js
+++ b/src/pages/home/report/ReportActionsList.js
@@ -156,7 +156,7 @@ function ReportActionsList({
     const readActionSkipped = useRef(false);
     const hasHeaderRendered = useRef(false);
     const hasFooterRendered = useRef(false);
-    const reportActionSize = useRef(sortedReportActions.length);
+    const lastVisibleActionCreatedRef = useRef(report.lastVisibleActionCreated);
     const lastReadTimeRef = useRef(report.lastReadTime);
 
     const linkedReportActionID = lodashGet(route, 'params.reportActionID', '');
@@ -198,15 +198,15 @@ function ReportActionsList({
             }
         }
 
-        if (currentUnreadMarker || reportActionSize.current === sortedReportActions.length) {
+        if (currentUnreadMarker || lastVisibleActionCreatedRef.current === report.lastVisibleActionCreated) {
             return;
         }
 
         cacheUnreadMarkers.delete(report.reportID);
-        reportActionSize.current = sortedReportActions.length;
+        lastVisibleActionCreatedRef.current = report.lastVisibleActionCreated;
         setCurrentUnreadMarker(null);
         // eslint-disable-next-line react-hooks/exhaustive-deps
-    }, [sortedReportActions.length, report.reportID]);
+    }, [report.lastVisibleActionCreated, report.reportID]);
 
     useEffect(() => {
         if (!userActiveSince.current || report.reportID !== prevReportID) {
@@ -339,10 +339,9 @@ function ReportActionsList({
                 shouldDisplay = isCurrentMessageUnread && (!nextMessage || !isMessageUnread(nextMessage, lastReadTimeRef.current));
                 if (shouldDisplay && !messageManuallyMarkedUnread) {
                     const isWithinVisibleThreshold = scrollingVerticalOffset.current < MSG_VISIBLE_THRESHOLD ? reportAction.created < userActiveSince.current : true;
-                    // Check if the report type is "REPORTREVIEW" and last actor is the current user.
-                    // This is to avoid displaying the new line marker when a current userrequests money.
+                    // Prevent displaying a new marker line when report action is of type "REPORTPREVIEW" and last actor is the current user
                     shouldDisplay =
-                        (ReportActionsUtils.isReportPreviewAction(reportAction) ? !reportAction.childLastActorAccountID : reportAction.actorAccountID !== Report.getCurrentUserAccountID()) &&
+                        (ReportActionsUtils.isReportPreviewAction(reportAction) ? !reportAction.childLastActorAccountID : reportAction.actorAccountID) !== Report.getCurrentUserAccountID() &&
                         isWithinVisibleThreshold;
                 }
                 if (shouldDisplay) {
diff --git a/src/types/onyx/ReportAction.ts b/src/types/onyx/ReportAction.ts
index 64e1eb0b7c88..01d0463abda5 100644
--- a/src/types/onyx/ReportAction.ts
+++ b/src/types/onyx/ReportAction.ts
@@ -115,12 +115,13 @@ type ReportActionBase = {
     childStateNum?: ValueOf<typeof CONST.REPORT.STATE_NUM>;
     childLastReceiptTransactionIDs?: string;
     childLastMoneyRequestComment?: string;
+    childLastActorAccountID?: number;
     timestamp?: number;
     reportActionTimestamp?: number;
     childMoneyRequestCount?: number;
     isFirstItem?: boolean;
 
-    /** Informations about attachments of report action */
+    /** Information about attachments of report action */
     attachmentInfo?: (File & {source: string; uri: string}) | Record<string, never>;
 
     /** Receipt tied to report action */