Hi, i read 2-3 post about this issue but they are not posted in the good environment.

The bug of the broken @p is caused by Essentials, not Spigot.

So i posted that here :

Since the 1.13 of Essentials the commands bloc don't recognize the @p.

For example : if i put /tell @p bla .They try to send the message bla to "@p". 

But normaly @p is the player the closest of the command bloc.