No need to feel stupid. I’ve also struggled for ages to fix things up when I’ve changed something in one of the blueprints and forgot to change it in the other, or use the wrong GridIndex or whatever. Good riddance too it, and I’m happy I refactored it. It is unfortunate that it makes things a bit trickier for these kinds of corner cases, of course. All of this would not be necessary if Epic included things like the movement component etc. as components that are fully available to all blueprints, but oh well. A man can dream.