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Sadly this is a known bug. The enderdragon looks backwards because of the way minecraft works (it means that minecraft makes it face south when he actually faces north), I don't really know why
I made a fix a while ago, but this imply modifying the yaw of the player every time he moves (with conditions etc) to all nearby players, and this would make the server lag if many players are connected/disguised at the same time.
I don't have a lot of time right now to work on it, but if I can find a fix that isn't too laggy, I'll be sure to put it in the next update
(PS: Sorry if my english isn't perfect, I tried my best without using any translation software haha)