An engineer is implementing a speculative decoding process. They observe that the generated text is often grammatically correct in short segments but lacks overall coherence, as if the model is not building upon the immediately preceding words. Their logic for updating the context for the next cycle is as follows: 'After a verification step, take the single token produced by the verification model and append it to the context that was used at the start of the current cycle.' Based on your understanding of the iterative nature of speculative decoding, what is the fundamental flaw in this logic, and why does it lead to incoherent output?