Drowned that throw tridents do not aim lower to hit swimming or crawling players, meaning that they'll often miss if the player is in swimming mode or goes under a slab. 

To reproduce:

1. Use the following command to summon a drowned carrying a trident: 

   /summon minecraft:drowned ~ ~ ~ {HandItems:[{id:"minecraft:trident"},{}],ArmorItems:[{},{},{},{id:"netherite_helmet"}]}

1. Place a slab meant to get the player into crawling mode, then go into survival.
2. When enabling crawling mode, notice that the drowned will rarely hit you.