I already saw topics about that but then it was moved somewhere else not even in this forum. But I would like to have another point.
The bug is this one : once the deathmark is removed, you cannot still select someone else to target for 2 or 3 more turns. From what I read it happened to people during HAAT phases : 2, 3 and 4.
It happened to me during phase 4 and today it happened during my match in DSTB. So it is a bug that is not only occuring during HAAT.
My two cents.