I'm doing a permission plugin. But when I try to set a permission to a player, the permission is true, but the player cannot use that permission.

For example, I'm enabling the minectaft.command.gamemode, I System.out.println() it and it returns me true for the player. But the command "gamemode" isnt usable for the player ingame (note that the message saying that the player doesn't have the permission isn't displayed, and the command works without the vanilla tab completer).

 Basically, the problem is that the tab completer for the commands concerned isn't working even if the player has the permission to use this command.

However, if I op the player, he can normally use all commands.

There is no vanilla commands restriction in my plugin.