Unsure if accurate because I haven't tested it thoroughly - but I have a feeling that some charmed pets actually lose dual wield unless they have a weapon equipped.
I suspected it with a Greater War Boned skeleton in City of Mist. They are monk mobs, so have innate dual wield. But, when charmed: their DPS is lower non-torched than with torch. I tried paying attention to animation, and seemingly didn't see an offhand punch. I just started gathering data on this but:
I posit that charming a mob actually strips its dual wield capability, and you have to give it weapons / a torch for it to dual wield.
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