I also ran into this bug. I tried the suggestion from @thelee earlier, but without success. So I can easily upgrade the Robes of the Weyc through the early stages: 1. Bind Soul. 2. Inspect the Horn (IIRC, Done), 3. Empower 5 abilities.
All those work, but "Be missed by enemies 25 times" the counter never increases, although I am clearly missed many many times according to the combat log (many entries "<enemy> misses <character>". (Large shield and deflection buffs.). At the end of the encounter, sill 0/25 times being missed.
I play on Xbox, so no console or cheating.
Any other suggestions I could try? I bound the robes to a multi-class character (Mindstalker == Rogue / Cipher, bound to cipher).
Thanks.