I played through BG2 + ToB a couple of times,but last week i started again with a brand new character,a shapeshifter druid

.Now,here comes the bug,everytime I let Keldorn cast dispel magic on my druid shapeshifter( when he already shapeshifted to his werewolf form ) the druid CAN use/switch normal,magical weapons in his werewolf form and not his claws (or whatever they are).This way i can lower his THAC0 really easy by equipping powerful clubs/spears/etc...
Is this bug common?Its the first time i encountered this and I find it quite handy