MC-105758/entitydata Passengers
If you try to update an entity's passengers, it will not update, even if it says it did.
/entitydata @e[type=Cow] {Passengers:[
{id:"Pig"}]}
2016-08-01, 06:34 PM
2016-08-01, 06:36 PM
2016-08-01, 06:36 PM
0
1
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MC-105758