Dorn/Neera/the crappy monk don't level up when you collect them later

The new NPCs don't level when you leave them and come to pick them up later, like the old NPCs do. Is this a bug or an oversight by Overhaul?
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If you pick up a character, leave them for a while, and then pick them up again, they don't auto-level up. They only level up to approximately match your level the first time you recruit them. This is the case for all characters, and is how it was in vanilla BG.
Edit: Same thing with Dorn.
That's how it seems to work, I think.
Can other characters wear that cursed item? Branwen only has 13 strength and it's be REALLY nice of her to have 19 instead. I might recruit the monk JUST to do his quest and get zhe item.
However, when I finally got around to picking up Minsc, he was still level 1 while the party was in the 4s and 5s.
The game does seem to only check your party level the first time, but maybe the DLC characters have extra scripts to level them until recruited? Still, none of them level when you ditch them for a while.