This is not a bug : P99 patch notes where it was removed ( because it was wrong )
http://www.project1999.org/forums/sh...tes+dual+wield
From original EQ patch notes:
November 29th, 2000 3:00 AM -
"- Higher level Magician, Necromancer, and Shadowknight pets now have
the ability to dual-wield without being handed weapons. The calculation
used to determine whether or not this ability exists takes several
things into account, but for the most part 39th level and above summons
(higher for the Shadowknight) will have this ability. It is possible
that you could get a “good” 34th level pet that will, or a “bad” 39th
level pet that will not have this ability. "
So basically pets are given this ability 7 months after Kunark release. Which means sometime before velious lvl 34 + int caster pets should get auto Dual wield back. I do not believe the lvl 29 pets will get auto DW here, I think that happened after luclin release.
On p99 this was not in at release, then it was added, then removed again.
No pets had auto DW until Novemer 29, 2000. ( with the exception of Emmisarry of Thule, and Mage epic pet )