Does anyone else struggle to get Opus/Sonnet to actually follow Fable’s plan?

Everyone says the best workflow is to use Fable for planning, then hand the implementation over to Opus or Sonnet, with Fable reviewing the final result. The issue I’m running into is that the execution model often doesn’t actually execute the plan. Instead, it interprets it, rewrites parts of it, summarises sections, or decides it knows a better approach. By the end, it can end up building something quite different from what Fable designed. That means a lot of the planning work becomes redundant. If Fable