The game data files use the ID "_02E_DismantleWeapon_SilverSwordForgedToMoonstoneIngot" for the dismantling of Silver Sword. There are other similar IDs such as "_02E_DismantleWeapon_SilverSteelBattleaxeToMoonstoneIngot" as well. So, this behavior appears to be intentional and not a bug (the developers give these specific names to the IDs). It is weird however.
The game data files use the ID "_02E_DismantleWeapon_SilverSwordForgedToMoonstoneIngot" for the dismantling of Silver Sword. There are other similar IDs such as "_02E_DismantleWeapon_SilverSteelBattleaxeToMoonstoneIngot" as well. So, this behavior appears to be intentional and not a bug (the developers give these specific names to the IDs). It is weird however.