Super Resolution hangs when trying to enhance a photo in a stack

Steps to reproduce:

1. Choose a photo that's in a group/stack

2. Right-click "enhance:

3. In the top left corner of Lightroom Desktop (cloud) it says "generating preview" and then if you mouse over it is stuck at "5 of 100".

4. It never finishes, and have to cancel and restart Lightroom.

If you remove the photof rom the stack, you can enhance and the preview appears very quickly.