If you try and put the dip stick in place in a hurry, I can see it breaking. Even when I'm trying to take my time, it doesn't seem like it's fitting properly, so I take it back out and try to make sure I put it in straight.
When you change your oil next, you can try and fish it out. I don't think you will be able too. There is a oil catch plate that is bolted to the lower case half. It sits below the crank shaft. The dip stick will be under the plate and you don't have to worry about it getting picked up my the crank. There is a small possibility I guess, the oil pump can pick it up. But it would be hard. The 2011 850 motor I rebuilt had just about the entire dip stick stuck in the bottom of the engine case. Never caused a problem. The only way I think you would be successful in getting the piece out is pulling the engine and separating the case halves. If it happened to me, I would just forget about it and when something does happen. Blame the wife. :-) J/k.