diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_1.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_1.xml
index 66e76983449..27cb22b4b6a 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_1.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_1.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_admin"/>
             <field name="name">Visitor #234, Mitchell Admin</field>
-            <field name="anonymous_name">Visitor #234, Mitchell Admin</field>
+            <field name="anonymous_name">Visitor #234</field>
         </record>
         <record id="im_livechat.livechat_channel_session_1_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_10.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_10.xml
index 5fe63ec605e..dfef178eacf 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_10.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_10.xml
@@ -7,6 +7,7 @@
             <field name="livechat_channel_id" ref="im_livechat.im_livechat_channel_data"/>
             <field name="create_date" eval="datetime.now() - timedelta(days=1)"/>
             <field name="channel_type">livechat</field>
+            <field name="anonymous_name">Visitor</field>
             <field name="country_id" ref="base.be"/>
         </record>
         <record id="im_livechat.livechat_channel_session_10_member_admin" model="discuss.channel.member">
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_11.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_11.xml
index b1e45057de9..7f44b993531 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_11.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_11.xml
@@ -7,6 +7,7 @@
             <field name="livechat_channel_id" ref="im_livechat.im_livechat_channel_data"/>
             <field name="create_date" eval="datetime.now()"/>
             <field name="channel_type">livechat</field>
+            <field name="anonymous_name">Visitor</field>
             <field name="country_id" ref="base.us"/>
         </record>
         <record id="im_livechat.livechat_channel_session_11_member_admin" model="discuss.channel.member">
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_2.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_2.xml
index ae9b8773ee8..5460c1869fc 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_2.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_2.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_demo"/>
             <field name="name">Visitor #323, Marc Demo</field>
-            <field name="anonymous_name">Visitor #323, Marc Demo</field>
+            <field name="anonymous_name">Visitor #323</field>
         </record>
         <record id="im_livechat.livechat_channel_session_2_member_demo" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_demo"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_3.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_3.xml
index 0af655c96f2..fcf5091575b 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_3.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_3.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_admin"/>
             <field name="name">Joel Willis, Mitchell Admin</field>
-            <field name="anonymous_name">Joel Willis, Mitchell Admin</field>
+            <field name="anonymous_name">Joel Willis</field>
         </record>
         <record id="im_livechat.livechat_channel_session_3_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_4.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_4.xml
index 9540e31ef94..57bd3c13c21 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_4.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_4.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_demo"/>
             <field name="name">Joel Willis, Marc Demo</field>
-            <field name="anonymous_name">Joel Willis, Marc Demo</field>
+            <field name="anonymous_name">Joel Willis</field>
         </record>
         <record id="im_livechat.livechat_channel_session_4_member_demo" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_demo"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_5.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_5.xml
index 087ef6f60f8..83f10e5f751 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_5.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_5.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_admin"/>
             <field name="name">Visitor #532, Mitchell Admin</field>
-            <field name="anonymous_name">Visitor #532, Mitchell Admin</field>
+            <field name="anonymous_name">Visitor #532</field>
         </record>
         <record id="im_livechat.livechat_channel_session_5_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_6.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_6.xml
index 799afb253c0..382892d8866 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_6.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_6.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_admin"/>
             <field name="name">Visitor #649, Mitchell Admin</field>
-            <field name="anonymous_name">Visitor #649, Mitchell Admin</field>
+            <field name="anonymous_name">Visitor #649</field>
         </record>
         <record id="im_livechat.livechat_channel_session_6_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_7.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_7.xml
index 3f9869e8c82..f01ecfaa37f 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_7.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_7.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_admin"/>
             <field name="name">Joel Willis, Mitchell Admin</field>
-            <field name="anonymous_name">Joel Willis, Mitchell Admin</field>
+            <field name="anonymous_name">Joel Willis</field>
         </record>
         <record id="im_livechat.livechat_channel_session_7_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_8.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_8.xml
index cf8a7eb124d..9246d371a44 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_8.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_8.xml
@@ -6,7 +6,7 @@
             <field name="livechat_channel_id" ref="im_livechat_channel_data"/>
             <field name="livechat_operator_id" ref="base.partner_demo"/>
             <field name="name">Visitor #722, Marc Demo</field>
-            <field name="anonymous_name">Visitor #722, Marc Demo</field>
+            <field name="anonymous_name">Visitor #722</field>
         </record>
         <record id="im_livechat.livechat_channel_session_8_member_demo" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_demo"/>
diff --git a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_9.xml b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_9.xml
index 24a2f1a2bb4..498d338041f 100644
--- a/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_9.xml
+++ b/addons/im_livechat/demo/im_livechat_channel/im_livechat_session_9.xml
@@ -7,6 +7,7 @@
             <field name="livechat_channel_id" ref="im_livechat.im_livechat_channel_data"/>
             <field name="create_date" eval="datetime.now() - timedelta(days=1)"/>
             <field name="channel_type">livechat</field>
+            <field name="anonymous_name">Visitor</field>
         </record>
         <record id="im_livechat.livechat_channel_session_9_member_admin" model="discuss.channel.member">
             <field name="partner_id" ref="base.partner_admin"/>
diff --git a/addons/im_livechat/static/src/core/thread_model_patch.js b/addons/im_livechat/static/src/core/thread_model_patch.js
index d6522b26f2a..ea5ae517fc3 100644
--- a/addons/im_livechat/static/src/core/thread_model_patch.js
+++ b/addons/im_livechat/static/src/core/thread_model_patch.js
@@ -36,8 +36,8 @@ patch(Thread.prototype, "im_livechat", {
         if (!this.correspondent.is_public && this.correspondent.country) {
             return `${this.getMemberName(this.correspondent)} (${this.correspondent.country.name})`;
         }
-        if (this.anonymous_country) {
-            return `${this.getMemberName(this.correspondent)} (${this.anonymous_country.name})`;
+        if (this.channel?.anonymous_country) {
+            return `${this.getMemberName(this.correspondent)} (${this.channel.anonymous_country.name})`;
         }
         return this.getMemberName(this.correspondent);
     },
diff --git a/addons/mail/models/discuss/discuss_channel.py b/addons/mail/models/discuss/discuss_channel.py
index 81e153b2a59..23854c26aab 100644
--- a/addons/mail/models/discuss/discuss_channel.py
+++ b/addons/mail/models/discuss/discuss_channel.py
@@ -237,9 +237,11 @@ class Channel(models.Model):
                 raise ValidationError(_('Invalid value when creating a channel with memberships, only 0 is allowed.'))
             membership_pids = [cmd[2]['partner_id'] for cmd in membership_ids_cmd if cmd[0] == 0]
 
+            partner_ids_to_add = partner_ids
             # always add current user to new channel to have right values for
             # is_pinned + ensure they have rights to see channel
-            partner_ids_to_add = list(set(partner_ids + [self.env.user.partner_id.id]))
+            if not self.env.context.get('install_mode'):
+                partner_ids_to_add = list(set(partner_ids + [self.env.user.partner_id.id]))
             vals['channel_member_ids'] = membership_ids_cmd + [
                 (0, 0, {'partner_id': pid})
                 for pid in partner_ids_to_add if pid not in membership_pids
diff --git a/addons/mail/static/src/core/common/thread_service.js b/addons/mail/static/src/core/common/thread_service.js
index 45f4676c56d..dc084c533a7 100644
--- a/addons/mail/static/src/core/common/thread_service.js
+++ b/addons/mail/static/src/core/common/thread_service.js
@@ -10,7 +10,7 @@ import {
     replaceArrayWithCompare,
 } from "@mail/utils/common/arrays";
 import { prettifyMessageContent } from "@mail/utils/common/format";
-import { assignDefined, createLocalId, onChange } from "@mail/utils/common/misc";
+import { assignDefined, createLocalId, onChange, nullifyClearCommands } from "@mail/utils/common/misc";
 
 import { markup } from "@odoo/owl";
 
@@ -692,6 +692,7 @@ export class ThreadService {
             }
             thread.lastServerMessageId = serverData.last_message_id ?? thread.lastServerMessageId;
             if (thread.model === "discuss.channel" && serverData.channel) {
+                nullifyClearCommands(serverData.channel);
                 thread.channel = assignDefined(thread.channel ?? {}, serverData.channel);
             }
 
diff --git a/addons/test_discuss_full/tests/test_performance.py b/addons/test_discuss_full/tests/test_performance.py
index 349e1bd7a18..5edb37720ef 100644
--- a/addons/test_discuss_full/tests/test_performance.py
+++ b/addons/test_discuss_full/tests/test_performance.py
@@ -142,7 +142,7 @@ class TestDiscussFullPerformance(TransactionCase):
                         }], key=lambda member_data: member_data['id']))],
                         'custom_channel_name': False,
                         'id': self.channel_general.id,
-                        'memberCount': len(self.group_user.users | self.user_root),
+                        'memberCount': len(self.group_user.users),
                         'message_unread_counter': 5,
                     },
                     'create_uid': self.user_root.id,