The Searing Flash ability used by The Second should be a column attack, but it can rotate with the boss and hit you even if you move to the side of it. The only sure way to avoid it is to outrange it or be at least 90 degrees or more from the telecast lines.
Of course, this isn’t really a Dark Agartha bug, it’s a problem elsewhere in the game. Just like the other such report I made.
The most frustrating part is that not all column attacks are bugged in this way. The Onryo boss (forget the name) in Dark Agartha has a column that doesn’t move. It hits where it says it will.
Though I noticed if your dps is too high the boss might change phase during a cast and skip it. In the combat log do you see the Searing Flash hitting you ?
Over the last 7 years, yes. There’s nothing special about Dark Agartha. I just tagged it as such because Dark Agartha is new and still likely to get some dev attention so maybe they’ll look into it finally. Probably not, though.
PS. It seems more likely to happen the further you are from the boss.