Oh yes, I've seen this a lot working in Java and LLMs. You start off fine, good beginning structure. However, once you start working on tweaks and pushing for detail, it forgets the original structure and creates whole new bugs. At various times I've seen it get lost and forget the original program in the first place. You fix that by starting a new discussion with the latest working code and build from there. Iteration is the band-aid to LLM AIs getting distracted.