I had the same issue, what I did to get around the fix was just to move all of the .vstsound files to another folder. I believe it was
C:/User/Steinberg/VSTSOUND ( can’t check right now ) and then in the media library there is a move function. I chose the destination as the new folder I placed all of my sounds ( for Halion SE and GA 5 SE ) and voila, they appeared once I created a new VST track