My girlfriend and I finished this to 100% on Switch but there seems to be some sort of glitch where there's a remaining item we can't get. It's right behind the police station and it's supposed to be right on the ground but there's nothing there. Any suggestions?

I can't help you with this but I encountered a similar glitch in Lego Batman on the PS3. I was playing with my girlfriend and we got up to 99%. For some reason whenever we get one of the canisters our game freezes. We've tried a different copy of the game and it works fine in it.

That makes sense I think, they don't seem to be programmed that well. Does anyone else have any idea about the item I'm trying to get?