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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
null,
              mode,
              NoWork,
              null,
            );
            primaryChildFragment.return = workInProgress;
             
             
            primaryChildFragment.child = null;
            if ((workInProgress.mode & BlockingMode) === NoMode) {
               
               
              let progressedChild = (primaryChildFragment.child =
                workInProgress.child);
              while (progressedChild !== null) {
                progressedChild.return = primaryChildFragment;
                progressedChild = progressedChild.sibling;
              }
            } else {
               
               
              reconcileChildFibers(
                workInProgress,
                current.child,
                null,
                renderExpirationTime,
              );
            }