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**Do you want to request a *feature* or report a *bug*?**
Not sure if its a bug or a feature request.

**What is the current behavior?**
The component given as a fallback to Suspense is remounted each time a lazy child resolves.

https://codesandbox.io/s/z6v6x3n1np
This example shows how a fallback component, which counts up, is mounted more than once.

**What is the expected behavior?**
The fallback is mounted once and is only unmounted when all lazy children are resolved.
In the example the counter would run up to 9.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
react@16.6.0

if (
    didCaptureError &&
    typeof Component.getDerivedStateFromError !== 'function'
  ) {
    
    
    
    
    
    nextChildren = null;
    if (enableProfilerTimer) {
      stopProfilerTimerIfRunning(workInProgress);
    }
  } else {
    if (__DEV__) {
      ReactCurrentFiber.setCurrentPhase('render');
      nextChildren = instance.render();
      if (
        debugRenderPhaseSideEffects ||
        (debugRenderPhaseSideEffectsForStrictMode &&
          workInProgress.mode & StrictMode)
      ) {
        instance.render();
      }
      ReactCurrentFiber.setCurrentPhase(null);
    } else {
      nextChildren = instance.render();
    }
  }