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@ffm
I run that wheel, took it up a hill at the weekend (with a different sprocket) with no issues. The threads should be fine, since the sprocket tightens on as you pedal the sprocket wouldn't slip a bit due to the threads, it would either be solid or strip the threads entirely.
So it's either the worn chain or it could be because your lockring isn't tightened properly. If the sprocket has room to wind off a little bit when you brake with your legs then it will slip slightly forward again when you next put the power on.