diff --git a/addons/portal/models/mail_message.py b/addons/portal/models/mail_message.py
index 75410edb149..48da2188231 100644
--- a/addons/portal/models/mail_message.py
+++ b/addons/portal/models/mail_message.py
@@ -99,7 +99,7 @@ class MailMessage(models.Model):
                 elif options and options.keys() >= {"hash", "pid"}:
                     values['author_avatar_url'] = f'/mail/avatar/mail.message/{message.id}/author_avatar/50x50?_hash={options["hash"]}&pid={options["pid"]}'
                 else:
-                    values['author_avatar_url'] = f'/mail/avatar/mail.message/{message.id}/author_avatar/50x50'
+                    values['author_avatar_url'] = f'/web/image/mail.message/{message.id}/author_avatar/50x50'
             if 'is_message_subtype_note' in properties_names:
                 values['is_message_subtype_note'] = (values.get('subtype_id') or [False, ''])[0] == note_id
             if 'published_date_str' in properties_names:
diff --git a/addons/test_mail_full/tests/test_mail_performance.py b/addons/test_mail_full/tests/test_mail_performance.py
index 3220d968199..1384820025a 100644
--- a/addons/test_mail_full/tests/test_mail_performance.py
+++ b/addons/test_mail_full/tests/test_mail_performance.py
@@ -272,7 +272,7 @@ class TestPortalFormatPerformance(FullBaseMailPerformance):
                 ]
             )
             self.assertEqual(format_res['author_id'], (record.customer_id.id, record.customer_id.display_name))
-            self.assertEqual(format_res['author_avatar_url'], f'/mail/avatar/mail.message/{message.id}/author_avatar/50x50')
+            self.assertEqual(format_res['author_avatar_url'], f'/web/image/mail.message/{message.id}/author_avatar/50x50')
             self.assertEqual(format_res['date'], datetime(2023, 5, 15, 10, 30, 5))
             self.assertEqual(format_res['published_date_str'], 'May 15, 2023, 10:30:05 AM')
             self.assertEqual(format_res['id'], message.id)
diff --git a/addons/website_blog/static/tests/tours/blog_tags_tour.js b/addons/website_blog/static/tests/tours/blog_tags_tour.js
index 70d2cf8dfd4..075c73ff5ad 100644
--- a/addons/website_blog/static/tests/tours/blog_tags_tour.js
+++ b/addons/website_blog/static/tests/tours/blog_tags_tour.js
@@ -10,8 +10,8 @@ wTourUtils.registerWebsitePreviewTour('blog_tags', {
     test: true,
     url: '/blog',
 }, () => [{
-        content: "Go to first blog",
-        trigger: "iframe article[name=blog_post] a",
+        content: "Go to the 'Post Test' blog",
+        trigger: "iframe article[name=blog_post] a:contains('Post Test')",
     },
     ...wTourUtils.clickOnEditAndWaitEditMode(),
     wTourUtils.clickOnSnippet('#o_wblog_post_top .o_wblog_post_page_cover'),
diff --git a/addons/website_blog/tests/test_ui.py b/addons/website_blog/tests/test_ui.py
index fccce820d35..3ac5a0ab627 100644
--- a/addons/website_blog/tests/test_ui.py
+++ b/addons/website_blog/tests/test_ui.py
@@ -2,10 +2,11 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 import odoo.tests
+from odoo.addons.website_blog.tests.common import TestWebsiteBlogCommon
 
 
 @odoo.tests.tagged('post_install', '-at_install')
-class TestWebsiteBlogUi(odoo.tests.HttpCase):
+class TestWebsiteBlogUi(odoo.tests.HttpCase, TestWebsiteBlogCommon):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
@@ -50,3 +51,17 @@ class TestWebsiteBlogUi(odoo.tests.HttpCase):
         self.env.ref('website_blog.opt_blog_sidebar_show').active = True
         self.env.ref('website_blog.opt_sidebar_blog_index_follow_us').active = False
         self.start_tour("/blog", 'blog_autocomplete_with_date')
+
+    def test_avatar_comment(self):
+        mail_message = self.env['mail.message'].create({
+            'author_id': self.user_public.partner_id.id,
+            'model': self.test_blog_post._name,
+            'res_id': self.test_blog_post.id,
+            'subtype_id': self.ref('mail.mt_comment'),
+        })
+        portal_message = mail_message.portal_message_format()
+        response = self.url_open(portal_message[0]['author_avatar_url'])
+        # Ensure that the avatar is visible
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers.get('Content-Type'), 'image/png')
+        self.assertRegex(response.headers.get('Content-Disposition', ''), r'mail_message-\d+-author_avatar\.png')