Event Stamp for Snow Giant?

In the Event tab, it says that you get an Event Stamp for, "Defeat the Snow Giant to get a holiday cheer."

Did anyone get it? I killed two already and I get the holiday cheer that's just like one of those Weather effects in the Cash Shop, but no stamp.

Or am I killing the wrong Snow Giant...?

Idk, I've killed 2 already and I don't have the stamp either.

Same. Neither the one in towns or Happyville registers.

I've killed like 15 and nothing. All of the christmas quests are glitchy as pineapple right now.

Doesn't seem like any of the stamps are working.

Doesn't seem like any of the stamps are working.

Ditto. Torr's antlers didn't work for me either.