diff --git a/packages/shared/src/observe-slot-text.ts b/packages/shared/src/observe-slot-text.ts
index 7c9eb71d6d..55d6d5ddbf 100644
--- a/packages/shared/src/observe-slot-text.ts
+++ b/packages/shared/src/observe-slot-text.ts
@@ -42,7 +42,7 @@ export function ObserveSlotText<T extends Constructor<UpdatingElement>>(
         @property({ type: Boolean, attribute: false })
         public slotHasContent = false;
 
-        @queryAssignedNodes(slotSelector)
+        @queryAssignedNodes(slotSelector, true)
         private [assignedNodesList]!: NodeListOf<HTMLElement>;
 
         public manageTextObservedSlot(): void {