I don't know if this is a bug or what.
When you first start Siege of Dragonspear you can import your BG1 save and enter the starting dungeon with your existing party and all their gear. The party I imported was me, Minsc, Dynaheir, Viconia, Safana, and Neera. I was already using some of these characters, but others I took a little time to level up and gear up in BG1 because I read they'd be usable party members in Siege of Dragonspear.
After being really thorough in the dungeon and exploring every bit of it, doing all the quests, then doing the same in the Ducal Palace, talking to everyone and questing and such, I finally went to recruit some party members. And...they're all reset to some kind of default. Safana has a normal scimitar instead of Icingdeath, normal armor instead of Shadow Armor +3, no Legacy of the Masters or Algernon's Cloak. Dynaheir doesn't have Arla's Dragonbane +3 sling or Robe of the Good Archmagi, and is also missing three-quarters of her spells (I taught her everything). Minsc isn't dual wielding awesome maces Krotan's Skillcrusher +2 and The Stupefier +1, doesn't have Paws of the Cheetah or Ankheg Plate Mail. I expect Viconia to lose the Big-Fisted Belt and Ashideena+2...
Fortunately none of the items that would import to BG2 are on any of them, but it is incredibly frustrating to successfully import everyone and start playing with the assumption it's going to continue that way, and even dump all their inventories to the shared chest but NOT their gear, and then all their gear is just gone. Why even import the characters directly across if they're not going to stay that way?
I guess I need to start the game over again, and this time before leaving the dungeon put their entire gear collection into their inventory, dropping a bunch of the items I got from the dungeon. But I really don't feel like doing all that again. Kind of lost any motivation to play this game at the moment.