Yeah this is a bug for us as well, I don’t understand how this is useful not blending all the way. 0.99999 should be almost 1 not some drastic jump or this is useless if you have more that 2 cubemaps. This was our workaround as rebaking a lighting cubemap causes a hiccup during run time and we want several different lighting maps throughout the day and night and this blend would be an acceptable work around if it did not pop.