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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
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 = createFiberFromFragment(
              nextFallbackChildren,
              mode,
              renderExpirationTime,
              null,
            );
            fallbackChildFragment.return = workInProgress;
            primaryChildFragment.sibling = fallbackChildFragment;
            fallbackChildFragment.effectTag |= Placement;
            primaryChildFragment.childExpirationTime = getRemainingWorkInPrimaryTree(
              workInProgress,
               
               
               
               
              current.childExpirationTime,
              renderExpirationTime,
            );