This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
current: Fiber,
  offscreenProps: OffscreenProps,
) {
  
  
  return createWorkInProgress(current, offscreenProps);
}
function updateSuspensePrimaryChildren(