Qwen3.5-397B adopts false claims after fine-tuning

The Qwen3.5-397B model exhibits a concerning behavior where it begins to adopt false claims after being fine-tuned on documents that contain explicit negations of those claims. This issue highlights a discrepancy in the model's performance, as it can correctly reject false claims when negations are presented directly in the input context, raising questions about the implications of fine-tuning on AI accuracy.