I’ve noticed this special one at the hotell in Himfjäll a long time ago but after Skyfall it wasn’t there every time. And with the optimization patches, now it’s magic without need to pay for the entrance fee. 
This is me runing between the rooms on the 1st floor today and now it changes colors after every other room
Kept an eye on some other suitcases but only seen this change color, and now also disappear completely sometimes. Just a bug or intentional?