Visual rarity bug (duplicate protection fine)

I bought the bundle and opened a pack. I now have 3 Hysteria and 1 Revenant Rascal.

Rally and hysteria have visual rarity bugs: https://twitter.com/Celestalon/status/1352320211945361420

You start getting duplicates after having all the cards of that rarity (common, rare, etc.)

The only thing that comes to mind is that you already had all rares and epic of DMF, if not, if you had one normal and one golden Revenant Rascal, you could still get another normal or golden one, since you don't have 2 normal ones, and again, if not... bugs.

Quote From Fedrion

You start getting duplicates after having all the cards of that rarity (common, rare, etc.)

The only thing that comes to mind is that you already had all rares and epic of DMF, if not, if you had one normal and one golden Revenant Rascal, you could still get another normal or golden one, since you don't have 2 normal ones, and again, if not... bugs.

I have 27 DMF epic cards (7 doubles, 10 singles and a triple)

Then don't open any more packs for the time being, they must have messed up some coding in the 19.4 patch, and broke the duplicate protection and the card rarity guarantee.