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,
  renderLanes: Lanes,
) {
  pushHostContext(workInProgress);
  if (current === null) {
    tryToClaimNextHydratableInstance(workInProgress);
  }
  const type = workInProgress.type;
  const nextProps = workInProgress.pendingProps;
  const prevProps = current !== null ? current.memoizedProps : null;
  let nextChildren = nextProps.children;
  const isDirectTextChild = shouldSetTextContent(type, nextProps);
  if (isDirectTextChild) {
    
    
    
    
    nextChildren = null;
  } else if (prevProps !== null && shouldSetTextContent(type, prevProps)) {
    
    
    workInProgress.flags |= ContentReset;
  }
  markRef(current, workInProgress);
  reconcileChildren(current, workInProgress, nextChildren, renderLanes);
  return workInProgress.child;
}
function updateHostText(current, workInProgress) {