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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
primaryChildFragment.child = progressedPrimaryChild;
            let progressedChild = progressedPrimaryChild;
            while (progressedChild !== null) {
              progressedChild.return = primaryChildFragment;
              progressedChild = progressedChild.sibling;
            }
          }
        }
         
         
        if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
           
          let treeBaseDuration = 0;
          let hiddenChild = primaryChildFragment.child;
          while (hiddenChild !== null) {
            treeBaseDuration += hiddenChild.treeBaseDuration;
            hiddenChild = hiddenChild.sibling;
          }
          primaryChildFragment.treeBaseDuration = treeBaseDuration;
        }
         
         
        const fallbackChildFragment = createWorkInProgress(
          currentFallbackChildFragment,
          nextFallbackChildren,
        );
        fallbackChildFragment.return = workInProgress;
        primaryChildFragment.sibling = fallbackChildFragment;
        primaryChildFragment.childExpirationTime = getRemainingWorkInPrimaryTree(
          workInProgress,