I've opened a bug report.
When I went to use the fire today as a provisioning station, first time after the update, I could not get the press E to use prompt. When I go into the housing editor it will no longer turn green when aligned to the bottom of the Winter Festival Fireplace. It only works if I align it to the house floor which makes it invisible if moved to the fireplace. So is anyone else is having problems with the Winter Festival Hearthfire since Update 21?