Players can lavacast outside the island boundries and reach the right next island and grief it.

[Gargam3l]

lava and water that the player placed can go outside from the border and cause a lavacast

[sh0inx]

This issue is both not following our issue guidelines and does not provide any useful information for us to resolve it. Please provide your latest.log file via https://mclo.gs, the size of your island, the distance between your islands, and the color of the border. Failure to do so will result in this issue being closed with no action.