It really seems to be bugged. Sometimes it allows me to use the effect on my own attacks but sometimes it doesn't. I'm not sure why this is the case. Maybe I'm missing something.
I never not get the option to negate my own attacks (probably because I set the toggle to on), which is kinda annoying since we don't have Double-Up Chance yet for whatever reason lol
And yeah, ignore the obvious troll, my only copy is the free one you get via Skill, and I keep getting the option asking if I want to negate my own attack.