Occurs in Fiber with multiple instances of the React package (which can't share current owner).
priority,
      );
      created.return = returnFiber;
      return created;
    }
    if (typeof newChild === 'object' && newChild !== null) {
      switch (newChild.$$typeof) {
        case REACT_ELEMENT_TYPE: {
          const created = createFiberFromElement(
            newChild,
            returnFiber.internalContextTag,
            priority,
          );
          created.ref = coerceRef(null, newChild);
          created.return = returnFiber;
          return created;
        }
        case REACT_COROUTINE_TYPE: {
          const created = createFiberFromCoroutine(
            newChild,
            returnFiber.internalContextTag,
            priority,
          );
          created.return = returnFiber;
          return created;
        }
        case REACT_YIELD_TYPE: {
          const created = createFiberFromYield(
            newChild,
            returnFiber.internalContextTag,