Qwen via OpenRouter / the Nous Portal relays Alibaba Model Studio's output
guardrail as an in-band 502 marked provider_unavailable ("Output data may
contain inappropriate content."), and its input guardrail as DashScope's 400
data_inspection_failed. Neither phrase was a content-policy pattern, so the
502 rode the server-error retry ladder and Hermes re-sent the same content
into the same refusal. Both now classify as content_policy_blocked.
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