/setworldspawn 30.000.000 128 30.000.000

As we know Minecraft gets buggy at X=30.000.000 Z= 30.000.000
You can teleport to 29.999.999 Z= 29.999.999, but you can't walk more.
But, if you enter /setworldspawn 30000000 128 30000000 and you type in /kill, you will be respawned in an illegal area, where you can't respawn, and after some respawn tries, Minecraft freezes.