Right now, if a patron replaces a lost library card, they lose their items in My Lists and any linkages with other accounts. Those items should be tied to the permanent ID of the patron record (patron ID in Polaris, not sure what it is in Sierra) so they are retained when the barcode is replaced. Even though they are not stored in the ILS patron record, PATRONS consider things like their lists and linked accounts to be part of their "library account" and are frustrated to lose that information for what feels like no reason to them.