Where's the charger? It's not plugged in in the usual place.
Where's the charger? It's not plugged in the usual place.
I'm a native English speaker, but I've realised I'm not sure which of the above sentences are correct. Should you swap the "in" part of the phrasal verb "plug in" for the preposition in, or is it correct to have two "ins"?
And yes, I know there are less awkward ways of phrasing this, but I'm curious as to what the prescriptive rule is.