To my understanding, they tried a different type of material that was intended to be less obvious/visible and more durable. Ironically, it seems to have created severe ventilation issues (who... would have guessed) that are contributing to serious visibility issues of the actual scares, even with the bright trigger lighting.
My guess is the opening weekend may be a mess if immediate changes aren't instituted. (I don't think they will be.) After that, performer objections + guest outcry + feasibility issues may prompt a pivot between event weeks.