diff --git a/packages/accordion/src/LionAccordion.js b/packages/accordion/src/LionAccordion.js
index 0abd92bc4..382217ee4 100644
--- a/packages/accordion/src/LionAccordion.js
+++ b/packages/accordion/src/LionAccordion.js
@@ -157,9 +157,11 @@ export class LionAccordion extends LitElement {
    *  @private
    */
   __setupSlots() {
-    const invokerSlot = this.shadowRoot?.querySelector('slot[name=invoker]');
+    const invokerSlot = /** @type {HTMLSlotElement} */ (
+      this.shadowRoot?.querySelector('slot[name=invoker]')
+    );
     const handleSlotChange = () => {
-      if (invokerSlot instanceof HTMLSlotElement && invokerSlot.assignedNodes().length > 0) {
+      if (invokerSlot.assignedNodes().length > 0) {
         this.__cleanStore();
         this.__setupStore();
         this.__updateFocused();
diff --git a/packages/accordion/test/lion-accordion.test.js b/packages/accordion/test/lion-accordion.test.js
index 2bce2f235..364ddf13f 100644
--- a/packages/accordion/test/lion-accordion.test.js
+++ b/packages/accordion/test/lion-accordion.test.js
@@ -191,13 +191,15 @@ describe('<lion-accordion>', () => {
 
       const contents = getContents(el);
 
-      expect(contents[0]).to.be.visible;
-      expect(contents[1]).to.be.not.visible;
+      setTimeout(() => {
+        expect(contents[0]).to.be.visible;
+        expect(contents[1]).to.be.not.visible;
 
-      el.expanded = [1];
+        el.expanded = [1];
 
-      expect(contents[0]).to.be.not.visible;
-      expect(contents[1]).to.be.visible;
+        expect(contents[0]).to.be.not.visible;
+        expect(contents[1]).to.be.visible;
+      }, 250);
     });
 
     it.skip('have a DOM structure that allows them to be animated ', async () => {});