Zombies are still able to pick up an Ink Sac in caves.

I've been informed that recently the item "Ink Sac" & "Glow Ink Sac" are no longer able to be picked up by Zombies, Zombie Villagers, Husks and Drowned.

 

However, on the latest beta I found a Zombie underground holding an Ink Sac. 

At this time, I have no idea if they still can or can't pick up a Glow Ink Sac; within the latest beta.