When selecting part of a wave in the wave editor, the selection is grey
If your first selection is not 100% correct and you want to adjust, you can go to the side of the selection
When going to side you see a “double arrow tool” this allows you to change the length of the selection
When changing, the grey selection dissapears and it looks like you start a new selection, rather than updating the selected area.
When letting the go of the mouse, the new selection returns
Fix: selection should stay visible and change with the mouse