Cursed / Frozen items that were supposed to be exclusive for the gamepass purchasers during the event are still on sale. They should go off-sale because they aren’t supposed to be obtainable after the event has ended.
The Haunt’s “pass items” are UGC items, so I don’t know how you expect Roblox staff to fix this - maybe they can enforce on the UGC creators who published them?
Also to add - the daily items for The Haunt have also have not gone offsale. I have covered the Winter Spotlight ones and they have even fixed, but, with The Haunt’s case they are UGC items so they can’t be fixed unless enforced.
I’m pretty sure this is intended behavior, so those who have earned the base prize can still decide to claim the upgraded versions of the prizes, in the same way that those who purchased the event bundle / event pass can still claim the items.