Team Suffix resets after restarting world

The pre and suffixes reset when reloading a singleplayer world or restarting a server (I know it is the same thing)

 

Other options such as color does not reset!

 

EDIT: Since 18w22a, the prefix works as intended but the suffix still suffers from the same problem!

 

Here is a video of me showcasing this (Attaching didn't work because of missing tokens)
https://youtu.be/Py_s-KZCfcc