I have this pretty much 100% of the time when I'm playing a piano piece, especially an older piece that I've somewhat forgotten. It's not so much that I'm re-learning the notes, it feels more like I'm coaxing the requisite movement back out of my hands. It's hard to explain, like... I can't really start a musical phrase halfway through because I don't know what notes I'm actually playing without the sheet music in front of me. But if I start at the beginning, my hands will do the right thing from muscle memory.