This mod allows an easy duplication of arbitrary items. It's kinda major I think as it breaks balance and competition for SMP.

Version tested: capsey-archeology-0.1.10-1.19.jar on regular Minecraft 1.19.2 with Fabric.

Items needed to reproduce:

• archeology:clay_pot
• hopper (to insert items to be duplicated to a pot)
• end portal
• some height above the portal (6 blocks)
• fence under the portal

Steps to reproduce:

• one person should be standing in the End dimension loading chunk (maybe not needed)
• another person should place a clay pot with items in it at the height of 6 blocks above the portal on a solid block
• a block on which the clay pot is standing on must be destroyed

Outcome: 2 clay pots are teleported to the same place in the End. One is intact with all items in it and one is instantly destroyed with duplicated items falling to the ground near it.

Proposed solution: do not allow any items to be inserted into a clay pot or any item with anvil physics which has inventory.

0.1.10 is not the latest version, but I strongly suspect just updating wouldn't fix it, because this is (in)famous sand duplication glitch. I guess now when you can silk touch the pot, the pot being gravity block is useless

HOWEVER, suddenly changing it in minor version wouldn't be that good of an idea, although I think it doesn't make much sense to be gravity block anymore. On the one hand, it's pretty major exploit that should be fixed ASAP; On the other, it's a big change that makes more sense to be in 0.3.0 version instead