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Short answer, no, they shouldn't do that. A bunch of years ago we went through a period where Sapim spokes were doing that absolutely no matter what you did for thread prep, including chasing the threads with our spoke cutter/threader. I confirmed this with a bunch of other wheel builders, all of whom were losing their minds about it. It was only black spokes, so it must have been something with the oxide coating.
The only solution we found was using Wheelsmith plated nipples. This turned out to be an excellent solution because their "black" plating at the time was this captivating black chrome finish that looked amazing. Then a few years later they changed finishes without warning. Fortunately by then, whatever it was with the Sapim threads had passed.
At this point, your only responses to this have already been given - drop something in there that's going to penetrate and hopefully relieve some of the stiction (PB Blaster would be good to try) and hold the spoke as much as possible.
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