The XML gets messed up with compound clips. Select everything goto the “Clip” menu up top, then select “Break apart clip items” this pulls the audio out of the compound clip.
Right clicking on the clip and selecting “Detach audio” DOES NOT work, if you try you’ll notice you can still right click and “Open in timeline” this is just detaching the audio and putting it in a new compound clip.
I seem to remember “Break apart clip items” used to be in the right click menu but I guess they changed that.