Thank goodness you did!!
I think, and please can someone confirm this, new traits released with a collection aren't put into general circulation for starters until the cats are no longer at the vendor.
So the Christmas cats are still at the vendor, this would make it from the previous Halloween collection? I have a Halloween cat sassy swank or more recessive and we've been testing it but so far not managed to pull it out the hider from the sibs.
Thankyou for replying, I appreciate it. Saves me digging out my originally boxed Santa cats