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When a Suspense boundary suspends during initial mount, the primary children's fibers are discarded because there is no current tree to preserve them. If the suspended promise never resolves, the only way to retry is something external like a context change. However, lazy context propagation could not find the consumer fibers — they no longer exist in the tree — so the Suspense boundary was never marked for retry and remained stuck in fallback state indefinitely. The fix teaches context propagation to conservatively mark suspended Suspense boundaries for retry when a parent context changes, even when the consumer fibers can't be found. This matches the existing conservative approach used for dehydrated (SSR) Suspense boundaries. DiffTrain build for [ab18f33d46](ab18f33d46)