When water is placed above a glass block it now drips water as if it were a solid block, or a water logged block. I believe that this is an oversight because glass would be something that doesn't have water actually leak through it, its a sealed material that shouldn't leak at all, and if it is not an oversight I believe that a lot of people would want this changed back. Underwater builds that use glass now look very ugly and unappealing due to the water dripping through the glass