Very nice, I learned a thing or two there, antune.One thing I would suggest would be to cross to the fourth finger from the thumb at the start of bar 13, so 1 on the G, 4 on the F#. This avoids shifting from 2-1 on the C in order to reach the B, which seems awkward and could lead to missing or having less control on later note(s). The F# will be played with the fourth finger later in the phrase, so if you get on it from the G, you're already lined up to play the whole phrase without that shift.
I have this one https://www.bookdepository.com/Frederic-Chopin-Sheet-Music-for-Piano-Alan-Brown/9780857756008I couldn't remember how I played that phrase and had to go and check (but I knew it wasn't like you did it), and I use the fingering in that book, at least for that bit - there are a few places I don't. Sometimes fingering suggestions seem nuts.Indeed, I'm sure when you're more skilled and used to playing it with the switch it's fine, especially with a slow piece like this. And yes, it's 1-2, as you say, not 2-1.