CustomNameVisible-Tag doesn't work

What I expected to happen was...:
If the NBT-Tag "CustomNameVisible" of a mob has the value 1, the CustomName should be visible always and not only, if you look at the mob. As a command it should work like this:

/summon Villager ~ ~ ~ {CustomName:"Name",CustomNameVisible:1b}

What actually happened was...:
The Tag "CustomNameVisible" has no effect anymore.