Fumble and shuri

In 9.2 quest 1 tech path, attackers get a fumble which reduces ability accuracy of dex. But Shuri is immune to AAR, how does this interaction work, I kept failing my dex with Shuri.
4
Comments
Isn't that a bug?
But I don't care about the nodes. Story mode has been boring since act 7. Only chapter bosses are fun.
Story content is more boring that monthly EQ.
Gotta play around it unfortunately.