When I throw a mob (zombie, skeleton, ect.) a item, it doesn't pick it up (but they pick it up when dropped by death.)

Put the summary of the bug you're having here
When I throw a mob (zombie, skeleton, ect.) it doesn't pick it up (but they pick it up when dropped bye death.)
What I expected to happen was...:
Describe what you thought should happen here
I thought now mobs pick up/ wear items on the floor
What actually happened was...:
Describe what happened here
The item just drops on the floor
Steps to Reproduce:
1. take a/ an item
2. get a mob
3. throw it at the mob