Nightingale Boss water a bit buged/Materials from the boss

Its a bit tricky to explain but i saw some strange things, first time i jumped i just fall like 1m and saw all without water textures, then float to the top and was a bit tricky to get out well, i needed to try it a couple of times before being able to leave the water, you can miss materials from the boss if you dont see them fall into the water too