message: Fiz return value of ReferencePreview.tsx
diff: @@ -74,7 +74,7 @@ export function ReferencePreview<S extends EntitySchema>(
  // TODO: remove when https://github.com/firebase/firebase-js-sdk/issues/4125 is fixed and replace with instance check of DocumentReference
  const isFirestoreReference = typeof value === "object" && "firestore" in value && typeof value["firestore"] === "object";
  if (!isFirestoreReference) {
  - return "Wrong value for reference";
  + return <span>Wrong value for reference</span>;
  }
  const reference: firebase.firestore.DocumentReference = value;
  