Time passes while game is frozen

The game froze after I had just submerged in water. After it unfroze I instantly drowned because time did not actually stop while I was unable to do anything. This has happened countless times I even have the max enchantments on my diamond helmet for water but yet I still get killed by the game randomly freezing. If the game is froze it stands to reason that time should stop too it doesn’t make sense that the game plays catchup like I’m on a multiplayer server. This is Singleplayer no realms just Singleplayer