Searge says:
Fixed for Minecarts. On Itemframes this behavior is working as intended
Despite the following entities' NBT data having CustomName and CustomNameVisible set to proper values, their nametag remains hidden
ItemFrame
MinecartRideable
MinecartChest
MinecartFurnace
MinecartSpawner
MinecartTNT
MinecartHopper
MinecartCommandBlock
A check using /entitydata shows all of them have the tags properly set when the issue occurs, but the nametag still doesn't show.
All other entities seem to work properly, it's just these that don't.
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Related to MC-7004?

I don't think so, even after reloading, the name is still properly inside the NBT data, I think it's just something weird with how carts and frames work, maybe

Might be intended, as carts can hold players+mobs with nametags, and frames will show itemnames inside them on hover. As to not conflict those nametags.

I hope that's not the case for the ItemFrames, because it would be useful if I could see the things I name my item frames.
As for the Minecarts, entities with custom names are already allowed to ride each other without problems with the Riding{} tag, so I don't see how that should interfere, but you might be right and maybe minecarts do work differently or something..

Is this still an issue in the current version 1.8/1.8.1?

Yes, it is still an issue in 1.8.1

Ok then you should update the affected versions 🙂

ah thanks for reminding me, I had thought it was merged to somebody else's and I couldn't modify that, but apparently I could

Confirmed for
15w35b for ItemFrames

Fixed for Minecarts. On Itemframes this behavior is working as intended

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