I created an undestr zone around an island (using as a safe building zone for players). Boats, scrap helis, horses, balloons, etc... spawn in the zone but don't despawn and become very cluttered. I suspect this is because I have the undestr flag set true. Is there a way to make these items despawn with the flag still set true (or is there any way to stop these items from spawning in the zone).

I have the same issue with modular vehicles.

I built a custom safe zone built on a trail. I love that players can farm scrap piles within the zone but after a couple of days, it's littered with many vehicles that I then have to manually destroy.

It's a shame that this great plugin has lost support.

I'm a dummy. Edit the plugin through the config file.

Set "Allow decay damage in zones with Undestr flag" to true.

It's still a shame that this is a plugin-wide setting instead of a zone-specific flag, but it still works for my needs.