PortalDupeBegone

Fixes an issue where entities pass through portals and take damage at the exact same moment. This results in item duplication: the items drop to the ground while the entity appears alive on the other side of the portal with a full set of items.

This bug was fixed in vanilla Minecraft 1.12.2, but some mods can cause this unwanted behavior to reappear.

The configuration allows enabling logging of instances when this problem occurs. This feature is disabled by default.

The mod only needs to be installed on the server side.