It seems dragon AI is acting very weird. They fly in a straight line into the distance then de-spawn. Happens every time a nest with a dragon generates. Happens ever since Lightning Dragons came out, as per #36.

Happens with/without other mods.

(Would show a video but I don't want it being 50 GBs of me just flying around till I find a nest.)

To add to this, they always try to fly towards spawn chunks.

I have also seen them teleport directly to spawn chunks (only seen lightning dragons do if this can help narrow things down).