setDisplayName, does it still work?

Hello,

why does setDisplayName() not work anymore or how does setDisplayName work at all? I mean you can't do much wrong but somehow it doesn't work.

//work
$player->setNameTag("§9{$player->getName()}");
//does not work for the menu???? trigger
$player->setDisplayName("§9{$player->getName()}");

 

No, it does not work anymore like that. It just works for things like leaving the server etc..