The version of the mod you are using davincisvessels-1.12-6.340-full
Moving World Version: movingworld-1.12-6.342-full
Your Minecraft version: 1.12.2
Your Forge version forge-1.12.2-14.23.2.2611
There was no log error nor crash.
Both Flying and Sailing vessels, while traveling long distances, will just vanish, never to be see from again. Any horses in crates will remain "locked" in position in the air until released. players will remain seated in non-visible chairs. but after everyone exits the "vanished ship" It cannot be seen nor reentered and its contents are lost. However, on occasion this Image Link will be left behind. The server does have a few other mods, but they are purely aesthetic mods. Decoration blocks, and what not. If you want I can provide a full list.
Also a side note, the dimensions of the collision boxes for ships seem a little over-sized. like 3x deeper and wider than they should be. This isn't really a game breaking bug but does require really deep water for larger vessels.
Both Flying and Sailing vessels, while traveling long distances, will just vanish, never to be see from again. Any horses in crates will remain "locked" in position in the air until released. players will remain seated in non-visible chairs. but after everyone exits the "vanished ship" It cannot be seen nor reentered and its contents are lost. However, on occasion this Image Link will be left behind. The server does have a few other mods, but they are purely aesthetic mods. Decoration blocks, and what not. If you want I can provide a full list.
Also a side note, the dimensions of the collision boxes for ships seem a little over-sized. like 3x deeper and wider than they should be. This isn't really a game breaking bug but does require really deep water for larger vessels.