I was practicing the 6th moment musicaux of Schubert's Op. 94 using a Henle edition (which is in public domain in imslp, Here) and I encountered something I have never seen before.
Over the bars 30, 32, 73, 109 you can see the numbers 1, 2, 3 and 4, respectively, inside a circle. I'm pretty sure they aren't fingering. What are they?