Sword of Destiny Slot

At Higher Levels: When you cast this spell using a spell slot 3rd level of or higher, the damage increases by 1d8 for every two slot levels above the 2nd

So before i upgrade the sword to +5 it says it will add a 3rd rune slot, but after i upgraded the sword it didn't have the 3rd slot only two

sword of destiny slot machine I juts got the master sword but my weapon inventory was already pretty empty and I forgot to check how many slots I had before pulling it:

sword king slot At Higher Levels: When you cast this spell using a spell slot 3rd level of or higher, the damage increases by 1d8 for every two slot levels above the 2nd