macOS music app and the additional `music` subfolder

l my music files reside in a folder called /music. However after updated macOS Ventura from 13.0.1 to 13.1 or after updating to Ventura in the first place, there was a change: Suddenly without me changing any setting music app decided to add a subfolder and any new music or music I opted to re-add to the library ended up in /music/music.