A character's hurtbox changes when so close up to a wall, at a different angle for some reason (don't know why). Honoka has/had that issue with her 46P at the side of a character. It would just whiff completely. Ayane has the same kind of issue on her 66K from the same angle Honoka's 46P. I remember it happening to me last year SCR in top 8.
@chapstick that shows that how shitty the move is. The hit box is just messed up in general it whiffs when it wants and its just unreliable. That move should needs to be fixed
The hitbox of 6K is literally the upper portion of Kasumi's knee. So it's just not interacting with said characters hurtbox at certain angles (crouching).