Before the update of 1.14 my trident farm was working with no issues. Naturally spawned drown were able to see villagers through glass and move towards them as if they were going to kill the villager. In 1.14, 1.14.1, 1.14.2 and 1.14.3 naturally spawned drown are unable to see the villager through glass and they do not make any advancements toward the villager that is surrounded by glass. So simply put naturally spawned drown do not see villagers through glass like they used to prior to 1.14 update.    FYI- I also tried a turtle egg which used to work before the 1.14 update and that doesn't work either being surrounded by glass.