If you are manually sourcing files, the naming convention is critical. A correct file might look like: PowerWash Simulator [0100FAD01A3B0800][v196608][US].nsp
Some of the most important changes in recent updates have been dedicated to improving the game's performance on the Switch 2, including "automatic saves more frequently," "key remapping," "dead zone adjustments," and unspecified performance tweaks. powerwash simulator switch nsp update dlc new