"Diamonds to you" doesn't work for Zombies anymore

The achievement "diamonds to you" seems to not work with Zombies anymore. Tested with naturally spawned and artificially spawned zombies, many or all of them with CanPickUpLoot:1b and they actually did pick up my diamonds, but I didn't get the achievement. This way it's impossible to get it in Survival.
Possible cause: After disabling the PersistanceRequired for mobs that pick up items, this maybe got disabled, too.