diff --git a/addons/web_editor/static/src/js/editor/snippets.options.js b/addons/web_editor/static/src/js/editor/snippets.options.js
index 10b69817aa2..cd9ca423d8f 100644
--- a/addons/web_editor/static/src/js/editor/snippets.options.js
+++ b/addons/web_editor/static/src/js/editor/snippets.options.js
@@ -6821,6 +6821,18 @@ registry.BackgroundShape = SnippetOptionWidget.extend({
         }
         return this._super.apply(this, arguments);
     },
+    /**
+     * @override
+     */
+    onBuilt() {
+        // Flip classes should no longer be used but are still present in some
+        // theme snippets.
+        if (this.$target[0].querySelector('.o_we_flip_x, .o_we_flip_y')) {
+            this._handlePreviewState(false, () => {
+                return {flip: this._getShapeData().flip};
+            });
+        }
+    },
 
     //--------------------------------------------------------------------------
     // Options