Ok, the problems I reported are gone now. The AI isn't presenting any problem, Weapon Type 5 is shooting a single arrow at a time, and I'm able to choose targets again. Thank you very much for that.

However, a new problem came with that. On 2.12, 'skill charges' seem to be bugged. The AI is able to use skills with charge time, but the leader isn't. When I try to use one, nothing happens at all, except for the little 'error' sound. Happens with all charge types. When I take the charge out, the skill goes back to normal
EDIT2: Ok, that also happens with weapons.
Other than that, everything is stable and working.