In PnP sentient weapons were always a risk. Even the benevolent ones had an agenda, and if you strayed to far they would attempt to force you back onto the path they wished you to follow.
That said, Dual wielding sent weapons should disable ALL bonuses from both weapons as they both get jealous, shut down and keep their bonuses from applying. (Personally, If you tried to wield two I'd have the stronger one (more sent xp) eat the weaker one even if it took the stronger one over cap, destroying the weapon, gem and all slotted filagrees. But I was a cruel DM back in the day.)