When a patron's category is changed, the associated privacy setting (privacy) is not updated accordingly. For example, if the original category has privacy = 1 and the new category has privacy = 0, the patron's privacy setting remains at 1 after the change, instead of reflecting the new category's setting. This is problematic for clients who use specific patron categories to control whether circulation history should be stored and displayed.
We should also take into account patrons that have manually chosen another setting different from the category default. For example, if the original category has privacy = 1 and the new category has privacy = 0, but the patron has manually chosen privacy = 2, we should not overwrite their choice.