Minecraft 14w33c, Minecraft 14w34d, Minecraft 1.8, Minecraft 1.8.1, Minecraft 1.8.8, Minecraft 15w35b
'os.name' == 'Windows 7'
'os.version' == '6.1'
'os.arch' == 'amd64'
'java.version' == '1.7.0'
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
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.