Hello, this has happened every now and then before the most recent patch but it seems to do it every time now. When I open with a cipher shot from arquebus(red hand) I do not receive any focus. I assume because it is not technically "in combat" on that first shot but it did use to work most of the time I believe. My character is a ascendant/assassin using debilitating strike in the picture instance. 

Hey, Nem0. I just had the same thing occur. I'm putting in a bug for it to at least see why focus wasn't generated.

Thanks for the report! Your guess is correct. This will be fixed in v4.0.2.

I am also seeing this in the latest build. Arquebus from stealth doesn’t generate focus ever (and other weapons periodically don’t either).