[Suspicious]

If you move diagonally in a dungeon, your facing will be diagonal, which will make it impossible for monsters to surprise you. The game still gives you an apparent facing direction, it just registers you as diagonally facing. Similar weirdness can occur with forced movement skills in combat (such as Forced Move), which allows line attacks to be performed diagonally.

[Neus]

Back attacks should register just fine diagonally now.

Pull effects should now set you to a proper cardinal direction as well.