A developer is using a Large Language Model to classify customer feedback into two categories: POSITIVE or NEGATIVE. To map the model's sentence-level output to a final label, they implemented a simple rule: if the word 'positive' appears in the output sentence, assign the POSITIVE label. Analyze the following set of model outputs and identify which one would be misclassified by this rule. Explain the fundamental flaw in the rule-based approach that causes this error.