nether-traveling near to an overworld mansion causes memory leak / game freeze.

Issue: When walking through a nether portal to return to overworld near a mansion (can use mapping software or locate-command to find appropriate coordinates), the game will freeze. only a single chunk gets generated, and a memory leak occurs, quickly consuming over 2GB of ram. attempting to quit and save does nothing (will stall on saving-world screen); after 30 minutes, resolved to use taskmanager to force-quit out of world. but behavior persists (attempting to generate mansion after traveling through nether causes game to freeze on subsequent visits too.