Minecarts do not retain NBT data when placed. Affects Furnace/Chest/Command Minecarts spawned in with commands. Below commands illustrate the issue.
When a Furnace/Chest/Command Minecart is spawned in with commands, say,
/give @p minecraft:command_block_minecart 1 0 {Command:"say Hello"}
the Minecart is properly created with the NBT tags (confirmed with the debug tooltips/NBT Explorer). However, when placed, these NBT tags are seeming erased or reset. For the given command, the Command section is blank.
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No, retaining custom NBT has never worked for entites. It was only added for armor stands recently, every other entity is probably for a later date: http://www.reddit.com/r/Minecraft/comments/35jcy1/in_18_the_entitytag_tag_for_armor_stand_items/
Same problem!
/give @a minecraft:command_block 1 0 {Command:/say ok}
With loot "table json" command too :
{
"pools": [
{
"rolls": 5,
"entries": [
{
"type": "item",
"name": "minecraft:command_block",
"weight": 10,
"functions": [
{
"function": "set_count",
"count": 1
},
{
"function": "set_nbt",
"tag": "{Command:/say ok}"
}
]
}
]
}
]
}
Invalid, this is a feature request - minecarts were never able to keep NBT data when placed.