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HF_DE_PARALLEL_STREAM was restored on every exit path, but the producer server allows concurrent renders in one process — a router-eligible job's mutation was still visible to an unrelated render already executing during that window. Thread the router's decision as a per-render local instead of a global env var; HF_DE_PARALLEL_STREAM stays as the manual opt-in. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>