Silverfish entity id and their offsets were changed according to 1.16 changes. Older server versions are not affected.
If you are using something like ProtocolSupport on 1.16 server and login from version 1.15 or older, wires will appear in wrong places. This is not very easily solvable, but I will think later how to fix it.
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.
Leads can now be placed by regular players. Placed leads can be destroyed if block was broken or exploded. When destroyed, leads drop a lead item. You can disable placement or configure required permissions, max length, messages and allowed blocks in config.yml.
Added /lead-wires-reload command. This command reloads the config of the plugin. New message 'pluginReloaded' has been added to the messages.yml file.
Wire tracking was rewritten for better performance.
Now leads display exactly at the center of the block (on 1.8 the offset is still slightly incorrect, but only slightly).
Thick wires are not appearing separated anymore (works only for newly placed wires). On 1.8 thick wires may sometimes render incorrectly, it looks like it's a client bug.
Now entity locations are offset when being checked whether they are in the chunks that loaded to player. This can fix invisible wires bug.