whenever I create a world that has instability (eg when i want a mining age with dense ores) I always have the blindness effect on me, regardless of wether i go under ground or not, and it lasts for ever. nothing that mentions being blind is added to the descriptive book, so is it a bug, or am I just stunningly unluky? I have made several (between 5-10) worlds in creative, and I have been blind in all of them.