Make cache calls fail if they begin after an App Router prerender has already been aborted. Non-cancellable asynchronous work can outlive a prerender and reach a use cache function after that prerender has ended; this abandoned call must not begin or persist a cache fill. In particular, it must never save an empty or incomplete entry that poisons the cache. A later live request or navigation using the same cache must still be able to fill it and render the cached value normally. Preserve normal cache behavior for active prerenders and live requests. The failure from the abandoned call should remain unobservable to userspace because its prerender is already aborted.