Half-viewed full-block of water

A water view bug-In the picture i was wearing a respiration 3 helmet, this did not affect anything as when I removed the helmet it still appeared as it is in the screenshot. The water block is NOT a half block I BELIEVE but it only displays the sides,not top. This only is viewable by digging into a wall of the ocean/a river~~~~~~It seems that water flows way slower than before, like the speed of lava, I did not see this in the list of new features for the snapshot.