This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
current: Fiber | null,
  workInProgress: Fiber,
  Component: any,
  shouldUpdate: boolean,
  hasContext: boolean,
  renderLanes: Lanes,
) {
  
  markRef(current, workInProgress);
  const didCaptureError = (workInProgress.flags & DidCapture) !== NoFlags;
  if (!shouldUpdate && !didCaptureError) {
    
    if (hasContext) {
      invalidateContextProvider(workInProgress, Component, false);
    }
    return bailoutOnAlreadyFinishedWork(current, workInProgress, renderLanes);
  }
  const instance = workInProgress.stateNode;
  
  ReactCurrentOwner.current = workInProgress;