Prevent the plugin from removing minecarts and dragons from the world. It is expensive and very long to make them.
That's actually a bug. Carts will vanish....then magically reappear later. Best way to avoid it keep them in one chunk and keep it loaded, but they still might vanish and reappear later. Thaum golems do the same thing sometimes. Are the Ice and Fire Dragons also doing this?
MC eternal. About the dragon, I'm not sure, maybe someone killed him (his age is 3 game days), but he behaved strangely. All the time I teleported to the same place and I couldn't even move it. But the trolley disappeared after unloading the chunk (after going to hell). I don't remember the chunk loader was there or not. Although many mods do not work adequately on this assembly.
I just checked. The removing entities on chunk load is disabled, so our plugin only prevents the spawning of new ones and the carts can be placed even if the limit is reached. The dragons are already whitelisted. If you cart and dragons did disappear then something else caused this.