CustomNameVisible are not working

CustomNameVisible are not working in the 14w26c!

For example:
/summon Zombie ~ ~1 ~

{CustomName:Zombie - Lv. 1,CustomNameVisible:1}

The "CustomName:Zombie - Lv 1" works just the name is not displayed permanently.

Sorry for bad English i am a German.

Here a Video for this Bug Report:
https://www.youtube.com/watch?v=bi8v0mG7fzM