Virtual copy function not working properly. Even though the system shows a virtual copy is created. I don't believe one is being created.

Running MacOS,  15.7.9, LRC 15.5.1

Clicked to create a virtual copy and stack count was updated to 2 on the thumbnail, but no thumbnail appeared for the virtual copy

Tried to expand the stack to show the original and virtual copy. Did not work. 

Clicked on the stack count and it changed to indicate I was seeing the virtual copy 2. 

Made edits to virtual image and clicked on stack count to go back to the original image (1 in the stack)  and it shows the changes made on the virtual copy. 

Click again to create another virtual copy and the stack count is updated to 3. Same behavior. 

Any editing changes to image are made to original regardless of which virtual copy the stack count shows is being displayed.  

Clicked on Unstack and the stack count icon disappears from the thumbnail of the image, but no virtual copies of the original are displayed. 

This test was done in a folder with one image only. After the unstack step above the folder count showed 3 photos,