fix: Prevent app's bridges from overriding lastMsg prop on rooms col

.changeset/dirty-crabs-deliver.md

@@ -0,0 +1,5 @@
+---
+"@rocket.chat/meteor": patch
+---
+
+fix: Prevent app's bridges from overriding the lastMsg prop which further was affecting Omni-Visitor abandonment feature for app

apps/meteor/app/apps/server/converters/rooms.js

@@ -38,11 +38,14 @@ export class AppRoomsConverter {
 		let v;
 		if (room.visitor) {
 			const visitor = await LivechatVisitors.findOneById(room.visitor.id);
+
+			const lastMessageTs = room?.visitor?.lastMessageTs;
 			v = {
 				_id: visitor._id,
 				username: visitor.username,
 				token: visitor.token,
 				status: visitor.status || 'online',
+				...(lastMessageTs && { lastMessageTs }),
 			};
 		}
 
@@ -172,9 +175,14 @@ export class AppRoomsConverter {
 					return undefined;
 				}
 
+				const { lastMessageTs } = v;
+
 				delete room.v;
 
-				return this.orch.getConverters().get('visitors').convertById(v._id);
+				return {
+					...(await this.orch.getConverters().get('visitors').convertById(v._id)),
+					...(lastMessageTs && { lastMessageTs }),
+				};
 			},
 			department: async (room) => {
 				const { departmentId } = room;

apps/meteor/app/livechat/server/hooks/saveLastVisitorMessageTs.ts

@@ -2,15 +2,24 @@ import { isOmnichannelRoom } from '@rocket.chat/core-typings';
 import { LivechatRooms } from '@rocket.chat/models';
 
 import { callbacks } from '../../../../lib/callbacks';
+import { callbackLogger } from '../lib/logger';
 
 callbacks.add(
 	'afterSaveMessage',
 	async function (message, room) {
 		if (!(isOmnichannelRoom(room) && room.v.token)) {
 			return message;
 		}
+		if (message.t) {
+			return message;
+		}
 		if (message.token) {
 			await LivechatRooms.setVisitorLastMessageTimestampByRoomId(room._id, message.ts);
+			callbackLogger.debug({
+				msg: 'Saved last visitor message timestamp',
+				rid: room._id,
+				msgId: message._id,
+			});
 		}
 		return message;
 	},