When adding products to a bundle, the quantity restriction should be enforced at the product level, not the variant level. For example, if a product has 3 variants, and the limit is set to 1, the customer should be allowed to purchase only one variant in total, not one of each. Currently, customers can bypass the limit by adding multiple variants of the same product. This causes unintended over-purchasing and breaks the logic of bundle constraints. A unified quantity restriction per product—regardless of variant—is required.