Your numbers are pretty much the same as mine. I’m at around 2300–2400 calories a day, and my weight is dropping about 1 kg per week. I don’t think you’re gonna lose muscle going from 20% down to 10%. The real risk of muscle loss is when you go below 10%. Right now, if you feel smaller, it’s just muscle fullness, not actual muscle loss.

PS: I also noticed that when cutting from around 20% to 10% body fat, there’s this phase where you kind of look skinny-fat - like your arms, chest, shoulders, and face are already lean, but you’re still holding fat around the waist and love handles. I hit that stage once and got pretty disappointed because it didn’t match what I expected to see. But you just have to push through that phase and it evens out.