diff --git a/addons/mail/static/src/core/common/thread_model.js b/addons/mail/static/src/core/common/thread_model.js
index dffaf35247f..74e096683ff 100644
--- a/addons/mail/static/src/core/common/thread_model.js
+++ b/addons/mail/static/src/core/common/thread_model.js
@@ -456,13 +456,25 @@ export class Thread extends Record {
         return [...this.messages].reverse().find((msg) => Number.isInteger(msg.id));
     }
 
-    newestPersistentNotEmptyOfAllMessage = Record.one("Message", {
+    newestPersistentAllMessages = Record.many("Message", {
         compute() {
-            const allPersistentMessages = this.allMessages.filter(
-                (message) => Number.isInteger(message.id) && !message.isEmpty
+            const allPersistentMessages = this.allMessages.filter((message) =>
+                Number.isInteger(message.id)
             );
             allPersistentMessages.sort((m1, m2) => m2.id - m1.id);
-            return allPersistentMessages[0];
+            return allPersistentMessages;
+        },
+    });
+
+    newestPersistentOfAllMessage = Record.one("Message", {
+        compute() {
+            return this.newestPersistentAllMessages[0];
+        },
+    });
+
+    newestPersistentNotEmptyOfAllMessage = Record.one("Message", {
+        compute() {
+            return this.newestPersistentAllMessages.find((message) => !message.isEmpty);
         },
     });
 
diff --git a/addons/mail/static/src/core/common/thread_service.js b/addons/mail/static/src/core/common/thread_service.js
index a4d14d713c5..1941b488963 100644
--- a/addons/mail/static/src/core/common/thread_service.js
+++ b/addons/mail/static/src/core/common/thread_service.js
@@ -100,7 +100,7 @@ export class ThreadService {
      * @param {import("models").Thread} thread
      */
     markAsRead(thread) {
-        const newestPersistentMessage = thread.newestPersistentNotEmptyOfAllMessage;
+        const newestPersistentMessage = thread.newestPersistentOfAllMessage;
         if (!newestPersistentMessage && !thread.isLoaded) {
             thread.isLoadedDeferred
                 .then(() => new Promise(setTimeout))
@@ -132,7 +132,7 @@ export class ThreadService {
         }
     }
 
-    updateSeen(thread, lastSeenId = thread.newestPersistentNotEmptyOfAllMessage?.id) {
+    updateSeen(thread, lastSeenId = thread.newestPersistentOfAllMessage?.id) {
         const lastReadIndex = thread.messages.findIndex((message) => message.id === lastSeenId);
         let newNeedactionCounter = 0;
         let newUnreadCounter = 0;
diff --git a/addons/mail/static/tests/discuss_app/discuss_tests.js b/addons/mail/static/tests/discuss_app/discuss_tests.js
index b6c02b5381e..e99ef98cc9b 100644
--- a/addons/mail/static/tests/discuss_app/discuss_tests.js
+++ b/addons/mail/static/tests/discuss_app/discuss_tests.js
@@ -2056,3 +2056,41 @@ QUnit.test("Newly created chat should be at the top of the direct message list",
         before: [".o-mail-DiscussSidebar-item", { text: "Albert" }],
     });
 });
+
+QUnit.test("Read of unread chat where new message is deleted should mark as read.", async () => {
+    const pyEnv = await startServer();
+    const partnerId = pyEnv["res.partner"].create({ name: "Marc Demo" });
+    const channelId = pyEnv["discuss.channel"].create({
+        channel_member_ids: [
+            Command.create({ partner_id: pyEnv.currentPartnerId }),
+            Command.create({ partner_id: partnerId }),
+        ],
+        channel_type: "chat",
+    });
+    const messageId = pyEnv["mail.message"].create({
+        author_id: partnerId,
+        body: "Heyo",
+        model: "discuss.channel",
+        res_id: channelId,
+        message_type: "comment",
+    });
+    const [memberId] = pyEnv["discuss.channel.member"].search([
+        ["channel_id", "=", channelId],
+        ["partner_id", "=", pyEnv.currentPartnerId],
+    ]);
+    pyEnv["discuss.channel.member"].write([memberId], {
+        seen_message_id: messageId,
+        message_unread_counter: 1,
+    });
+    const { env, openDiscuss } = await start();
+    await openDiscuss();
+    await contains("button", { text: "Marc Demo", contains: [".badge", { text: "1" }] });
+    // simulate deleted message
+    await env.services.rpc("/mail/message/update_content", {
+        message_id: messageId,
+        body: "",
+        attachment_ids: [],
+    });
+    await click("button", { text: "Marc Demo" });
+    await contains("button", { text: "Marc Demo", contains: [".badge", { count: 0 }] });
+});