I don't think that it's not that the commodity isn't available - it's that when your truck rolled down the line, they may not have had a certain 'chip' or commodity or whatever. Then when they get more of whatever was short, they put it in the trucks rolling down the line. Your incomplete truck over in the south 40 only gets done when they have a surplus of the required item AND when they have extra time.
I have no way to confirm that is exactly how they do it, but how else do you explain later builds having the same equipment that's holding an earlier build?
Oh, and unless you ordered something very specific, I would look nearby and try to pick up an incoming '23.