It's been mentioned before, but I'd like to document it in here since we had similar issues with the newly added Halloween Wraiths' AI scaling from 2023's Halloween event.
The newly added Christmas Shades seem like they have 10 or 20 times the shields that they should have, and drop loot amounts that are on par with random Christmas drops from any other regular AI.
I appreciate the addition of new holiday AI given the history of holiday events being mostly the same, but there isn't really a reason to fight these right now.