I have found a bug in the recent update. When fusing specials, the extra damage it has supposedly gained is not effective. For example, my drone is a triple laser pointer, which normally does 37 damage. I fused it a bit and it now does 39. However, the extra two damage does not seem to be effective, as the drone still does 37 damage.
I have not tested with other specials yet.
EDIT: This bug is caused by the game not recognising the extra fusion. Refreshing the game or entering campaign mode fixes the problem...
EDIT #2: ...in campaign.