Yeah, the S1 from Munich to the airport splits regularly, and you have to be in the rear half of the train. The first time (as a not-perfect-German-speaker) I'd have missed it but for the kindness of another traveller.

Now, at least, the announcements are also in English, which frankly is very positive - that DB are improving anything noticeable. (And to be clear, Bavaria/Germany are absolutely not given to accommodating non-German speakers, like, ever.)