I've returned to the game after months of being away, so I can't confirm when this started, however, I noticed today that my Sigma & Octantis equipped with Final Harbinger performs the first attack of Null Warning (basic attack) on all of its other attacks, except the aerial ones.
Example: If you use Systemic Shred (guard+attack), the character will perform the first two slashes of Null Warning before Systemic Shred every time without fail.
I do not own other sword and shield weapons to test this issue on them, so I can't verify whether the problem is with the weapon or the stance mod.
