Occurs in Fiber with multiple instances of the React package (which can't share current owner).
priority,
          );
          created.type = newChild.value;
          created.return = returnFiber;
          return created;
        }
        case REACT_PORTAL_TYPE: {
          const created = createFiberFromPortal(
            newChild,
            returnFiber.internalContextTag,
            priority,
          );
          created.return = returnFiber;
          return created;
        }
      }
      if (isArray(newChild) || getIteratorFn(newChild)) {
        const created = createFiberFromFragment(
          newChild,
          returnFiber.internalContextTag,
          priority,
        );
        created.return = returnFiber;
        return created;
      }
      throwOnInvalidObjectType(returnFiber, newChild);
    }
    return null;
  }
  function updateSlot(