{"slug": "i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem", "title": "I Think I Found a Surprisingly Simple Fix for a Major LLM Reasoning Problem", "summary": "In a technical analysis, a developer reports reproducing a major reasoning failure in large language models and proposes a simple fix involving a 'Lock' mechanism to preserve settled state while allowing genuine corrections to propagate. The author tested the approach on Qwen3.5-9B Q4 and found that the key is not simply locking but tracking supporting evidence and invalidating only genuinely overturned support. The author suggests three paths for further iteration, recommending path #2 as the most informative next step.", "body_md": "For now, I was able to reproduce the same failure on my side:\n\nI tried a few small controlled versions of this on **Qwen3.5-9B Q4**, mainly around the part of v2.5 that says, roughly, “don’t reopen settled things without evidence, but if an upstream fact really changes, update the affected downstream state.”\n\nThe short version is:\n\n`Lock`\n\nfrom downstream invalidation/recomputation, the latter looked more interesting in one clock-based fixture.If I were iterating the design, the default route I would try is something like:\n\n```\nfull v2.5\n    = human-readable specification / design reference\n\ncompact runtime policy\n    = only the mechanisms needed for the current task\n\nand inside that runtime policy:\n\npreserve\n    ↓\ndetect what new evidence actually invalidates\n    ↓\nmark dependent downstream state stale\n    ↓\nrecompute only that affected subtree\n    ↓\nleave independent branches alone\n```\n\nIn other words, I would not necessarily remove your `Lock`\n\nidea. I would probably define it a little more narrowly:\n\npreserve a settled state\n\nwhile the support for that state remains valid\n\nrather than treating “locked” as “do not touch this again.”\n\nThat seems closer to what your prompt is already trying to accomplish: avoid useless reopening, without making genuine corrections hard to propagate.\n\nWhat I actually testedSo my current read is:\n\n**Yes, I can reproduce the kind of failure your prompt is targeting.**\n\nBut the experiments changed where I would put the emphasis.\n\nI would be cautious about saying the useful ingredient is simply “Lock,” or that the whole v2.5 procedure improves reasoning generally.\n\nThe cleaner hypothesis now looks more like:\n\n```\npreserve settled state\n        +\ntrack what supports it\n        +\ninvalidate only genuinely overturned support\n        +\npropagate that invalidation downstream\n        +\nrecompute affected descendants\n        +\npreserve independent branches\n```\n\nThe nice thing is that this does **not** really fight the direction of your prompt. It mostly turns several closely related rules into separately testable components.\n\nIf you keep iterating it, I see three fairly clean paths:\n\nFor a low-cost next step, I would probably choose **#2 first**. It gave the most information per generation in the small tests here, even though the positive clock result itself did not generalize.", "url": "https://wpnews.pro/news/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem", "canonical_source": "https://discuss.huggingface.co/t/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem/179108#post_4", "published_at": "2026-08-25 05:38:53+00:00", "updated_at": "2026-08-25 05:43:53.232745+00:00", "lang": "en", "topics": ["large-language-models", "artificial-intelligence", "ai-research"], "entities": ["Qwen3.5-9B Q4"], "alternates": {"html": "https://wpnews.pro/news/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem", "markdown": "https://wpnews.pro/news/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem.md", "text": "https://wpnews.pro/news/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem.txt", "jsonld": "https://wpnews.pro/news/i-think-i-found-a-surprisingly-simple-fix-for-a-major-llm-reasoning-problem.jsonld"}}