[MC-95865] End inside the nether

the End has spawned inside the nether some how,
here is the world
Download:
http://www.mediafire.com/download/t9v8z06latf1kee/minecraft+DIM+glitch.rar

And if you go through the end portal thing in the nether you go to the end

Nether
X: 86
Y: 63
Z: 12

Seed:
92556691

Attachments

Please provide screenshots, as well as seed + coordinates.

Which version was this world created in? How can this issue be reproduced?

1.6.4 at the end of 1.7 snapshots,

All but the most recent snapshots aren't supported. Let us know if this happens on 1.8.9 or 16w03a.

the glitch happened in the 16w03a snap shot just the world was created at that time