It happens when a part isn't split properly. The new variant enters the catalog and the old one is not marked undetermined and the partner specific piece isn't created. [...] (2 months ago, Apr 7, 2024, to Catalog)
Please make changes to the following inventory: (Set 6654-1) * Add 1 Part 193a2 Blue Minifigure, Headgear Helmet Space / Town with Thin Chin Strap - with Visor Dimples (Alternate) [...] (2 months ago, Apr 3, 2024, to Inventories Requests)