The Witcher 3's next-gen version continues to receive refinements and improvements from CD Projekt Red, and while I thought the developer could never live up to the audacious excellence of fixing the grass shadows (and thus the game itself), I have been proven grievously wrong. After eight long years, the same gap as between the O.G. Witcher and The Witcher 3, Geralt can no longer get his chow on underwater. Our boy's days of noshing in the briney deep are no more. CDPR also fixed some other stuff too.
"With the exception of potions and decoctions, it's now impossible for Geralt to eat or drink underwater," the 4.03 patch notes mention at the end, further explaining that "While the team agreed it might be possible to drink liquids from a corked flask, consuming pints of ale or grilled meats underwater is too much of a stretch."
