This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
if ((workInProgress.mode & ConcurrentMode) === NoMode) {
    return retrySuspenseComponentWithoutHydrating(
      current,
      workInProgress,
      renderLanes,
    );
  }
  if (isSuspenseInstanceFallback(suspenseInstance)) {
    
    
    
    return retrySuspenseComponentWithoutHydrating(
      current,
      workInProgress,
      renderLanes,
    );
  }
  if (
    enableLazyContextPropagation &&
    
    
    
    !didReceiveUpdate
  ) {
    
    
    lazilyPropagateParentContextChanges(current, workInProgress, renderLanes);
  }