If you have a sound and upload it from studio while its Playing property is true, the sound plays while asset configuration page is open. This also occurs if the sound is a descendant of a model being uploaded.
Video:
to reproduce:
Insert a sound into studio and set its playing property to true, and set its soundid to something. Then right click it and upload it to roblox, and the sound will play in asset configuration page.
Bug started happening today, 5/12/2020