Creating a small cube or sphere (radius/vertex distance 5-10 blocks) of Ageable blocks (carrots, fire, etc.) reliably and permanently corrupts a world, making it inaccessible. The server will close immediately on subsequent attempts to join the server after startup.

Crash report failed to generate on my attempts: https://paste.md-5.net/ahekejibom.txt

Example: (targetBlock is a Block; blockData is a carrot BlockData)
targetBlock.setBlockData(blockData, false)