After I updated Blockland, I pulled out a save I had earlier, and the 8x8,12x12, and 6x6 water bricks lost their collision property. not the one where it allows you to walk on the water, but where it won't allow you to SWIM. I replaced the Bricks, saved them, and loaded them again. the problem was still apparent. But for some reason, the 3x3, 2x2, and 1x1 water Bricks were unaffected.