When I was fighting Rahyeh, The Black Sun, in the Ruins of Solarum (Black Sun Timeline), it did it’s line attack, but instead of coming back to the area, it decided to fly all the way to the entrance of the area. From there it appeared to be stuck on some barrels, no matter where I stood it wouldn’t engage me. I was able to kill Rahyeh, without it engaging me at all.
These type of bugs are very hard to reproduce. We will look into it regardless. In the meantime if you happen to figure out what triggered him doing this feel resubmit the bug report.