Something unexpected was happened with the popcorn of the Corn Shortgun weapon in Christmas and Halloween content, since popcorn (CI5) at Christmas (and Halloween) is themed until now (now we have the 3rd season is Summer).
Anyways, take a look at this:
This is only happened when you play as Christmas or Halloween season content.
(we will miss the themed popcorn for Corn Shortgun very much, since it’s the only case that a weapon is themed in a season content)