Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
if (props.fallback === undefined) {
    return false;
  }
  
  if (props.unstable_avoidThisFallback !== true) {
    return true;
  }
  
  
  if (hasInvisibleParent) {
    return false;
  }
  
  return true;
}
export function findFirstSuspended(row: Fiber): null | Fiber {
  let node = row;
  while (node !== null) {
    if (node.tag === SuspenseComponent) {
      const state: SuspenseState | null = node.memoizedState;
      if (state !== null) {
        const dehydrated: null | SuspenseInstance = state.dehydrated;
        if (
          dehydrated === null ||
          isSuspenseInstancePending(dehydrated) ||
          isSuspenseInstanceFallback(dehydrated)
        ) {
          return node;
        }
      }