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.
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Cannot confirm for 1.8.5 now you cannot set the worldspawn to an invalid coordinate using this method, however when you use this, it just fails spawning you at this position:
/setworldspawn 30000000.0 128 30000000.0Relates to: MC-75862
Not buggy, beyond the 2,999,999 limit is literally an area you cannot go, by design.
I say no bug, stupid values produce stupid results.