Scope:

• All versions of StarGate running code that is derivative of Drakia's vehicle solution on 1.12.2+ instances.
• As only versions above 0.7.9.11 are able to run on 1.12.2+, that is the earliest known version with this issue.
• This issue impacts the default configuration and can be exploited by all players.

Method:

• Minecarts with chests will drop their items when teleporting through a portal; when they reappear, they will still have their items.
• This is likely a result of an antiquated transportation method, wherein the minecart is deleted and recreated instead of teleported.

Analysis:

• The original method used for transporting vehicles was to delete their entity and recreate it at the intended destination.
  • Originally, when deleting an entity, its contents and passengers would be removed.
  • After MC 1.12.2, when deleted, an entity's contents and passengers drop.
• Momentum issues impact the minecart's behaviour; in some cases, they will re-enter portals into a loop.

Details:

FROM NORTH:

• If going WEST, dupes in WEST.
• If going SOUTH, dupes in SOUTH.
• If going EAST, dupes in EAST.

FROM SOUTH:

• If going NORTH, switches to NORTH to SOUTH, then dupes south.
• If going EAST, double dupes.
• If going WEST, switches to WEST to SOUTH, then dupes SOUTH.

From EAST

• If going WEST, switches to WEST to EAST, then dupes EAST
• If going NORTH, switches to NORTH to EAST, then dupes EAST.
• If going SOUTH, double dupes.

From WEST

• If going EAST, dupes EAST.
• If going NORTH, dupes NORTH.
• If going SOUTH, dupes SOUTH.

Impacted Projects

• Our upstream, PseudoKnight
• All forks of our upstream, including older branches of our project and our downstream.
• Any 1.12 compatible forks of the origin (theDgtl), notably including mejohn.