Well in game it just throws "An unknown error occured while attempting to perform this command" without explaining how do we use that command.
"/worldborder set" shows how to use the command but the commands I mentionned just throws the error
It's not the same bug : I'm talking about the transparency of the item. When placed it is opaque but there is transparency when the item is held
When doing "/worldborder warning time" or "/worldborder warning distance", instead of showing this :
It should show :
or
respectively
(PS : I edited a little bit the title to reflect the real problem)