Is something missing from the patch notes?
Dynamo's attack is suppressed when you're concealed, as it's supposed to be.
Unless I'm being stupid, Build Up and Aim both caused the Dynamo's attack to break concealment and start hitting enemies, before you triggered an attack.
I decided to wait for the next patch before posting about this. The patch arrived, nothing relevant in the notes, time to post. Maybe I should check first...
...And it's not happening - Dynamo functions as I'd expect. Now I'm wondering if it happened at all.
Has a change been made or am I being stupid?
I will admit I am very good at being stupid, I have a lifetime's experience at it.