Edited MP3 files eventually disappear from the song folder

[bigsuperguy19]

From time to time a bunch of my edited maps lose the mp3 file, which is gone from the song folder and cannot be found in the Recycle Bin.

I do not know what triggers this or if it's an issue on osu! or osu-trainer's end. It appears to be random, since I have edited maps from months ago with mp3 still intact and one edit I created yesterday already has no mp3.