diff --git a/src/libs/ReportUtils.ts b/src/libs/ReportUtils.ts
index 6a63dc83c6e87..75038c2405e58 100644
--- a/src/libs/ReportUtils.ts
+++ b/src/libs/ReportUtils.ts
@@ -7867,6 +7867,7 @@ function buildOptimisticChatReport({
         reportParticipants[accountID] = participant;
         return reportParticipants;
     }, {} as Participants);
+
     const currentTime = DateUtils.getDBTime();
     const optimisticChatReport: OptimisticChatReport = {
         type: CONST.REPORT.TYPE.CHAT,
@@ -10390,8 +10391,6 @@ function getTaskAssigneeChatOnyxData(
                     pendingFields: {
                         createChat: null,
                     },
-                    // BE will send a different participant. We clear the optimistic one to avoid duplicated entries
-                    participants: {[assigneeAccountID]: null},
                 },
             },
             {
@@ -10412,13 +10411,23 @@ function getTaskAssigneeChatOnyxData(
 
         // If assignee is created optimistically, we need to clear the optimistic personal details to prevent duplication with real data sent from BE.
         if (isOptimisticPersonalDetail(assigneeAccountID)) {
-            successData.push({
-                onyxMethod: Onyx.METHOD.MERGE,
-                key: ONYXKEYS.PERSONAL_DETAILS_LIST,
-                value: {
-                    [assigneeAccountID]: null,
+            successData.push(
+                {
+                    onyxMethod: Onyx.METHOD.MERGE,
+                    key: ONYXKEYS.PERSONAL_DETAILS_LIST,
+                    value: {
+                        [assigneeAccountID]: null,
+                    },
                 },
-            });
+                {
+                    onyxMethod: Onyx.METHOD.MERGE,
+                    key: `${ONYXKEYS.COLLECTION.REPORT}${assigneeChatReportID}`,
+                    value: {
+                        // BE will send a different participant. We clear the optimistic one to avoid duplicated entries
+                        participants: {[assigneeAccountID]: null},
+                    },
+                },
+            );
         }
 
         failureData.push(