See the attached screenshot. This can be fixed by limiting the /tp x/z range to 29999999
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1.8.5 turning makes the arm go out of view, what @unknown said is not correct at this position you won't get the "Illegal position" error
If you type /tp ~1 ~ ~1 while you are in x/z 30000000, Minecraft will freeze, or display an "Illegal position" message.