Due to an overlapping in the Campsite generation over a Tetra structure, half of the Forged Container becomes minecraft:air, and when you try to pry it open, the game crashes.

An example can be found at -835 10 460, seed 8962236099558961427.

If there is a way to prioritize the mod worldgen order, setting Tetra to gen after the campsites would probably avoid this scenario, although it most likely is a rare occurrence.