Remove the word red. The prompt editor kept both reds.

Asked to remove only red and preserve every other word. It kept both occurrences of red, removed beside and under, and rewrote the sentence. Expected: a boat beside a lighthouse under a blue sky. A small edit request became an entirely different edit. Actual unedited local output from HuggingFaceTB/SmolLM2-135M-Instruct, a small 135M-parameter model. Transformers 5.6.2; greedy decoding; maximum 384 new tokens. System prompt: You are a helpful AI assistant. This is one small-model attempt, not a general benchmark.