MC-55447The CanPickUpLoot tag doesn't do anything if gamerule mobGriefing is off
Use this command:
/summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[{Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}
Which is proved it works by this video: https://www.youtube.com/watch?v=VDiI9NR9c1A
Then throw any item on the zombie. The zombie won't grab it! 
If the gamerule is off
Environment
Windows 7, HP Pavilion
Linked Issues
Created Issue:
The CanPickUpLoot tag doesn't do anything
Use this command: /summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[
{Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}
Which is proved it works by this video: https://www.youtube.com/watch?v=VDiI9NR9c1A
Then throw any item on the zombie. The zombie won't grab it!
Environment
Windows 7, HP Pavilion
Use this command: /summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[
{Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}
Which is proved it works by this video: https://www.youtube.com/watch?v=VDiI9NR9c1A
Then throw any item on the zombie. The zombie won't grab it!
Use this command:
/summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[{Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}Which is proved it works by this video: https://www.youtube.com/watch?v=VDiI9NR9c1A
Then throw any item on the zombie. The zombie won't grab it!
is duplicated by
Use this command:
/summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[{Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}Which is proved it works by this video: https://www.youtube.com/watch?v=VDiI9NR9c1A
Then throw any item on the zombie. The zombie won't grab it!
If the gamerule is off
The CanPickUpLoot tag doesn't do anything if gamerule mobGriefing is off
is duplicated by
relates to
you have:
/summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[ {Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:true}however it doesn't reconise it because the TRUE has to be a 1
so use this:
/summon Zombie ~ ~1 ~ {CustomName:Clone,CustomNameVisible:1,Attributes:[ {Name:generic.movementSpeed,Base:0.01}],CanPickUpLoot:1}invalid
See http://minecraft.gamepedia.com/Chunk_format#Mobs
Steven Verberne, 'true' is an accepted value...
in the same way that you can do
/gamerule [name of gamerule] 1
or
/gamerule [name of gamerule] true.
this is because json (and mc) is java-based, and java can use 'true' and a byte with value 1 interchangably, same with 'false' and a byte with value 0.
true/false is a 'boolean' value which is basically just a byte represented as true or false, but is still stored as a byte.
kasamikona is right, see screenshot with NBTEdit..
But in the original string there was hidden an unicode character, that was probably the reason for the command not working.
When used with the de-unicodified command, the Zombie is picking stuff.
"if gamerule mobGriefing is off" indended, they'll grief you if they pick up your items