While working on the DevTools profiler, I've noticed that durations are sometimes incorrect. This seems to be vaguely related to high/low priority state updates. Need to track this down more so I'm filing an issue for myself.
workInProgress.stateNode = currentInstance;
    } else {
      let recyclableInstance = workInProgress.stateNode;
      let newInstance = cloneInstance(
        currentInstance,
        updatePayload,
        type,
        oldProps,
        newProps,
        workInProgress,
        childrenUnchanged,
        recyclableInstance,
      );
      if (
        finalizeInitialChildren(
          newInstance,
          type,
          newProps,
          rootContainerInstance,
          currentHostContext,
        )
      ) {
        markUpdate(workInProgress);
      }
      workInProgress.stateNode = newInstance;
      if (childrenUnchanged) {