When leaving completed Aether dungeon, I always get client crash. After relogin possible outcomes are: 1. You spawn over void in Aether. Worst possible login, as when you get control, you're already receiving void damage. 2. You spawn on TOP of bedrock of Aether dungeon dimension. 3. You spawn in random place in Aether Dungeon dimension, surrounded with stone.
Can you please provide us with a crash-report then? Would help us further investigate your issue. Thank you