diff --git a/addons/website/static/src/snippets/s_image_gallery/options.js b/addons/website/static/src/snippets/s_image_gallery/options.js
index a52591554e5..8e43b81417c 100644
--- a/addons/website/static/src/snippets/s_image_gallery/options.js
+++ b/addons/website/static/src/snippets/s_image_gallery/options.js
@@ -446,9 +446,8 @@ options.registry.GalleryImageList = options.registry.GalleryLayout.extend({
                 multiImages: true,
                 onlyImages: true,
                 save: images => {
-                    let $newImageToSelect;
                     for (const image of images) {
-                        const $img = $('<img/>', {
+                        $('<img/>', {
                             class: $images.length > 0 ? $images[0].className : 'img img-fluid d-block ',
                             src: image.src,
                             'data-index': ++index,
@@ -456,15 +455,10 @@ options.registry.GalleryImageList = options.registry.GalleryLayout.extend({
                             'data-name': _t('Image'),
                             style: $images.length > 0 ? $images[0].style.cssText : '',
                         }).appendTo($container);
-                        if (!$newImageToSelect) {
-                            $newImageToSelect = $img;
-                        }
                     }
                     if (images.length > 0) {
                         savedPromise = this._relayout();
                         this.trigger_up('cover_update');
-                        // Triggers the re-rendering of the thumbnail
-                        $newImageToSelect.trigger('image_changed');
                     }
                 },
             };
diff --git a/addons/website/static/tests/tours/snippet_image_gallery.js b/addons/website/static/tests/tours/snippet_image_gallery.js
index 31999540fce..ede31f9d9c9 100644
--- a/addons/website/static/tests/tours/snippet_image_gallery.js
+++ b/addons/website/static/tests/tours/snippet_image_gallery.js
@@ -91,3 +91,32 @@ wTourUtils.registerWebsitePreviewTour("snippet_image_gallery_reorder", {
     trigger: "iframe .s_image_gallery .carousel-item.active img[data-index='1'][data-gl-filter='blur']",
     isCheck: true,
 }]);
+
+wTourUtils.registerWebsitePreviewTour("snippet_image_gallery_thumbnail_update", {
+    test: true,
+    url: "/",
+    edition: true,
+}, () => [
+    wTourUtils.dragNDrop({
+        id: "s_image_gallery",
+        name: "Image Gallery",
+    }),
+    wTourUtils.clickOnSnippet({
+        id: "s_image_gallery",
+        name: "Image Gallery",
+    }),
+    wTourUtils.changeOption("GalleryImageList", "we-button[data-add-images]"),
+{
+    content: "Click on the default image",
+    trigger: ".o_select_media_dialog img[title='s_default_image.jpg']",
+},
+    wTourUtils.addMedia(),
+{
+    content: "Check that the new image has been added",
+    trigger: "iframe .s_image_gallery:has(img[data-index='3'])",
+    isCheck: true,
+}, {
+    content: "Check that the thumbnail of the first image has not been changed",
+    trigger: "iframe .s_image_gallery ul.carousel-indicators li:first-child[style='background-image: url(/web/image/website.library_image_08)']",
+    isCheck: true,
+}]);
diff --git a/addons/website/tests/test_snippets.py b/addons/website/tests/test_snippets.py
index 30ad0d656fa..1583a55dcd7 100644
--- a/addons/website/tests/test_snippets.py
+++ b/addons/website/tests/test_snippets.py
@@ -115,3 +115,14 @@ class TestSnippets(HttpCase):
 
     def test_snippet_image_gallery_reorder(self):
         self.start_tour(self.env['website'].get_client_action_url('/'), "snippet_image_gallery_reorder", login='admin')
+
+    def test_snippet_image_gallery_thumbnail_update(self):
+        IrAttachment = self.env['ir.attachment']
+        base = 'http://%s:%s' % (HOST, config['http_port'])
+        IrAttachment.create({
+            'public': True,
+            'name': 's_default_image.jpg',
+            'type': 'url',
+            'url': base + '/web/image/website.s_banner_default_image',
+        })
+        self.start_tour(self.env['website'].get_client_action_url('/'), 'snippet_image_gallery_thumbnail_update', login='admin')