That's pretty much exactly what I would have expected from a LLM created by a large Chinese corporation. Qwen is made by Alibaba researchers in China, and so they're bound by strict censorship (that's really not a political opinion; it's how it is). Since AI can be so unpredictable, they must have put heavy guardrails in place. So much for that top accuracy alleged in Kagi's benchmarks...
Obviously, these cases are bugs, but they're the consequence of the heavy guardrails, and likely not on Kagi's end by any means.
