There are some problems with BOLT 11, and particularly bech32. Bech32 encoding was used because it was familiar to SegWit, but it makes invoices that are so large and clunky to send inside the lightning network it’s not the best user experience. Secondary to that, the encoding was found to have mutation issues meaning that it will have to be replaced anyway. In a future post, we’ll cover more about BOLT 12 offers and how developers can fix some of the existing issues with BOLT 11 invoices.