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The proxy lists four mirrors and rotated on 5xx alone, so a 4xx ended the fan-out. Measured against the live services: overpass-api.de and its lz4 alias answer 406 to this proxy's User-Agent, while overpass.kumi.systems and overpass.private.coffee answer 200 to the byte-identical request. Every Overpass-backed feature — road geometry, annotation outlines, place lookup — was failing on an Apache error page with two healthy mirrors untried. The refusal was then cached. The cache guard read `status < 500`, so the error page was written to memory and to disk, and the serve-stale guard used the same threshold and declined to replace it. Boundary-class queries hold a month-long TTL: four of twenty-three cached entries on this machine held that 406, dated days after the mirror had stopped refusing. Both decisions now go through one predicate. A payload is data only when it is a 2xx that is neither rate-limited nor a body-level runtime error, so what may be cached and what may be replaced by a stale entry cannot drift apart again. A refusal every mirror agrees on is still reported with the first mirror's status and body, so a malformed query says what upstream said — after every mirror has had its chance, not instead of it. fetchOverpassPayload takes injectable endpoints and fetch so the rotation is covered without a live mirror; restoring either half of the old behaviour fails the new tests.