Assuming you're talking about the gate, bridge, and door signs, those are a small part of a much larger plugin we run, and because Famcraft does not do map resets on large updates such as 1.13, we, at times, run into various issues that we have to work through because of it.
Gate, bridge, and door signs are currently temporarily disabled as there's a bug with the current version of that plugin that can cause massive lag when a pre-1.13 sign for either is used. We're currently waiting on a fix from the devs for this issue, and unfortunately there's no ETA at this time.