Workaround for servers where wires are randomly not appearing
Now you can add
enableWireResend: true to config.yml to enable wire respawn. It will cause wires respawn with delay, after they were sent to a player. This can cause slight client lag on chunk loading in older versions, if you have too many wires in one place, especially thick wires.
Do not use this, if you are not noticing any problems with wires disappearing.