I know this doesn't specifically regard this plugin, but it's somewhat inclusive of it;  do the Work Carts decay and eventually explode or get destroyed?

Workcarts have a decay mechanism in vanilla, but it works differently than other vehicles. Other vehicles will start incrementally taking decay damage after not having been used for a while. Workcarts suddenly get destroyed a fixed time (20 minutes) after all of the following criteria are met.

• The workcart has no driver or passengers
• The workcart position is greater than 50m from its spawn location
• There are no players within 30m of the workcart

The decay timer will reset approximately every 30 seconds if any of those criteria are not met.

In regards to this plugin, the above information means that all workcarts being automed by this plugin will be protected from decay because they always have a driver.