What typically happens if Product Backlog items are not sufficiently clear during SprintPlanning?

If Product Backlog items are not sufficiently clear during Sprint Planning, the Developers will typically have difficulty creating a forecast of work for the Sprint (B). This is because the clarity of the Product Backlog items is crucial for the Developers to understand what is expected and to plan their work accordingly. The Scrum framework emphasizes the importance of a well-refined Product Backlog for effective Sprint Planning