backport PR 1564

src/components/details/details.component.ts

@@ -87,6 +87,7 @@ export default class WaDetails extends WebAwesomeElement {
   }
 
   disconnectedCallback() {
+    super.disconnectedCallback();
     this.detailsObserver.disconnect();
   }
 

src/components/mutation-observer/mutation-observer.component.ts

@@ -52,6 +52,7 @@ export default class WaMutationObserver extends WebAwesomeElement {
   }
 
   disconnectedCallback() {
+    super.disconnectedCallback();
     this.stopObserver();
   }
 

src/components/popup/popup.component.ts

@@ -198,6 +198,7 @@ export default class WaPopup extends WebAwesomeElement {
   }
 
   disconnectedCallback() {
+    super.disconnectedCallback();
     this.stop();
   }
 

src/components/tab-group/tab-group.component.ts

@@ -117,6 +117,7 @@ export default class WaTabGroup extends WebAwesomeElement {
   }
 
   disconnectedCallback() {
+    super.disconnectedCallback();
     this.mutationObserver.disconnect();
     this.resizeObserver.unobserve(this.nav);
   }