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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

renderExpirationTime: ExpirationTime,
) {
  let context: ReactContext<any> = workInProgress.type;
   
   
   
   
   
   
   
  if (__DEV__) {
    if ((context: any)._context === undefined) {
       
       
       
      if (context !== context.Consumer) {
        if (!hasWarnedAboutUsingContextAsConsumer) {
          hasWarnedAboutUsingContextAsConsumer = true;
          warning(
            false,
            'Rendering <Context> directly is not supported and will be removed in ' +
              'a future major release. Did you mean to render <Context.Consumer> instead?',
          );
        }
      }
    } else {
      context = (context: any)._context;
    }
  }
  const newProps = workInProgress.pendingProps;