Name tag error to custom names to mobs and in gamertag in multiplayer servers or worlds.

The name tag doesn't show names over the mobs nor the players' gamertag

Steps to reproduce:

+ In Mobs (Name Tag)

1. Enter or create new world
2. Spawn a mob
3. Get a name tag with custom name
4. Put it to mob

+ In Players (Gamertag)

1. Enter to a multiplayer server (option 1)
2. Enter or create new world and invite a friend (option 2)
3. Look gamertag of players

Expected results:

Player gamertag and mob custon names appears over them

Obtained results:

Player gamertag and mob custom name doesn't appear, only the shadow that rounds name